The animal belongs to the FAMILY of the Lemurs, LEMURINA s. PROSIMII, and to the first division of the family which is distinguished by Van der Hoeven in his valuable "Handbook of Zoology" (translated by the Rev. W. Clark, M.D., London, 1858), as follows:

PHALANX 1. Nail of the Index alone of the soles incurved, subulate. Upper incisor teeth four, in pairs.

A. With tarsus not elongate.

Under this great subdivision, it belongs to the

Genus STENOPS, Illig. (genera Loris and Nycticebus,

Geoff.)

Incisor teeth 4, canines 4'

1-1
1-1'

molars

6-6 6-6'

Ears short,

rounded. Eyes large, approximate. Index of hand short, not longer than pollex. Tail short, or none.

Van der Hoeven subdivides the Genus Stenops into the three following sections:

(a) Tail short. Index of hand very short, resembling an unarmed tubercle. (Perodicticus, Bennett.)

(Sp.) Stenops potto, Lemur potto, Gm., Nycticebus potto, Geoffr., Perodicticus Geoffroyi, Benn. Gold Coast of Guinea. Potto, Bosman.

(b) Tail very short (Nycticebus, Geoffr).

(Sp.) Stenops tardigradus, Auct., Lemur tardigradus, L. Bengal, Siam, Sumatra, Borneo. Stenops javanicus, nob., Nycticebus javanicus, Geoffr.

(c) Tail, none (Loris, Geoffr. Body slender; eyes very large, almost contiguous. Nose acute, sub-ascending).

(Sp.) Stenops gracilis, Loris gracilis, Geoffr., Lemur tardigradus, L. Ceylon.

The animal, now exhibited, belongs apparently to the first of these subdivisions (a.); although, with reference to the first character of this subdivision-that taken from the length of the tail-it agrees better with, and would therefore seem more naturally to come under, the second subdivision (b); the distinguishing and peculiar characteristic, however, of the subdivision (a) seems to be the undeveloped index finger, and with this my specimen exactly corresponds. The length of the tail would appear, therefore, to be rather doubtful as a distinctive

character; at least, this Angwántibo seems to be somewhat intermediate in its characters between the first two subdivisions of the genus Stenops as given by Van der Hoeven, viz. -(a) Tail short; index of hand very short, resembling an unarmed tubercle; and (b) Tail very short. The Angwántibo having the index of hand very short, resembling an unarmed tubercle; and also, the tail very short. To include this animal, the first character of section (a) would require to be altered to-tail short, or very short; index of hand very short, &c. It seems to me, indeed, from the discovery of this Angwántibo (assuming it to be a new species), that the greater or less length of the tail is not sufficiently distinctive to allow any characters taken simply from it to be used for the division into sections of the comprehensive genus Stenops of Van der Hoeven.

The generic character which Van der Hoeven gives of the GENUS Stenops-index of hand short, not longer than pollex, in the sections (b) and (c), or the equivalent GENERA Nycticebus, Geoff., and Loris, Geoff.-from the examination I have been able to make of these animals, appears to be due to the smaller relative size of the metacarpal bone, and the phalanges of the index finger, which are THREE in number, as in all the other fingers (except the thumb). In the Potto, however, and this Angwántibo (as will be afterwards described), which fall under his section (a), and the GENUS Perodicticus, Benn, the character of index of hand very short, resembling an unarmed tubercle, is due, not only to the small relative size of the bones of that finger, but also to the presence of only TWO very small phalanges (the same number as in the thumb), the other fingers having three. This anatomical difference forms a good distinction or character between section (a), the Genus Perodicticus, Benn., and the other Genera, which Van der Hoeven has also included in his great Genus Stenops.

The only species noticed by Van der Hoeven under section (a) of his genus Stenops, and, as far as I am aware, the only one known, is the Stenops potto or Perodicticus Geoffroyi of Bennett, and it, like this Angwántibo, is a native of Africa; the other described Genera, or species of Van der

Hoeven's Genus Stenops, are inhabitants of Asia, the East Indies, &c. Van der Hoeven, in his description of this species, the Stenops potto or Aposou, says-" The Aposo or Aposou of the negroes of the Gold Coast of Guinea is a nocturnal animal, which sleeps on trees and lives on fruits. The spinous processes of the last five cervical and of the first two dorsal vertebræ are long, and pierce through the hairy integument of the back, with a weak, horny covering. Professor Halbertsma first drew my attention to this peculiarity, which I have observed in two specimens."

On referring to the description of this same species (the Potto), placed under the Genus Perodicticus, and named P. Geoffroyi, by Mr E. T. Bennett, which is published in the "Proceedings of the Committee of Science of the Zoological Society of London," for 26th July 1831 (Part I., 1830-31). I find the animal now exhibited agrees with the general characters given there of the Genus (correcting the mistake of considering the projecting teeth in the front of the lower jaw as being all incisors, instead of both incisors and canines, according to the present view; and therefore the incisors only four in number, and not six, as Mr Bennett described them). To which I would add, as additional characters of the GENUS Perodicticus-tail short, or very short; index of hand very short, resembling an unarmed tubercle-supported by small metacarpal bone, and only TWO small phalanges. The Angwántibo seems to differ, however, from the details given of the species which he describes, the measurements of the Potto, or P. Geoffroyi, given by Bennett, being, "length of head 2 inches andths, of the body 6 inches; of the tail 1 inch ths, or, including the hair, 2 inches ths;" whereas, in my specimen, the whole length, from point of muzzle to extremity of tail, is about 10 inches; the tail being only of an inch in length, or, including the hair, which is about of an inch long, only an inch. The animal described by Bennett was immature, its dentition not being perfect; in the one now exhibited, the dentition is perfect. There seems to be other slight differences between the Potto and the Angwántibo, in the colour of the hair as well as in the relative size or propor

tions of the body and limbs, which I shall afterwards notice in describing this specimen; and while at present unable to procure various works for reference, or a specimen of the Potto itself for examination, and therefore in want of more information on the subject, I am inclined to consider this specimen of the Angwántibo as being a mature individual, and probably forming another species of the same genus, and one that, so far as I am aware, has not before been described, I therefore, from the locality where it was found, give it provisionally the name of the Stenops, or Perodicticus Calabarensis.

The Potto, or Perodicticus Geoffroyi, is found at Sierra Leone, a region of the African coast, at some distance from Old Calabar. It is also known by a different name, being the Aposo or Aposou of the Gold Coast. The letters of the missionaries (from which extracts were given at the commencement of this communication) seem to indicate the possible existence of more than one species, probably of allied animals-the Dwan of the Krumen, and this, the smaller Angwántibo of the natives of Old Calabar. Whether the Dwun and the Aposou are the same, or different species, I am unable to determine: they probably bear a considerable resemblance to one another. From the great variety in size, however, of the animals referred to in these letters, I am at present inclined to believe there may probably be two, if not three, distinct species,-the Aposou, the Dwun, and the Angwúntibo,-the Dwun being perhaps the largest in size.

Description of the ANGWANTIBO (from specimen in spirits:)— Perodicticus Calabarensis (Mihi)—above, yellowish-brown; the roots of hair dark gray; below, paler, in some parts nearly white; hair wool-like; length from muzzle to point of tail, 10 inches; tail very short, (about 4th of an inch in length).

Proximal phalanges of both hands and feet (not including the pollex) united together by the integuments; the two distal phalanges being free.*

* A hand of the Potto, figured in "Cuvier's Animal Kingdom"- London,

The Angwintibo is covered with a thick and long woollike hair, which becomes short and thin on the face and on the extremities, the inner sides of the fore and hind hands being free from hair. The hair is of a dark gray colour at the base, and the upper third or so of its length is of a light brown or fawn colour, the terminal points being of a darker brown; this is the general character of the fur of the upper parts of the body and limbs. The face in front of the eyes is rather darker in colour, but the sides of the head are lighter, and the chin and throat are nearly white. The inner surface of the limbs. is also lighter, as well as the whole under surface of the body, the gray hairs having their distal half of a light fawn colour, and in some places nearly white. The specimen having been for a long time preserved in spirits, makes it a little difficult to get at the minute details of colour. There are no stripes or markings on the back, or other parts of the body, to be observed on this animal, as on the Stenops tardigradus of the East Indies; its general appearance being more uniform over the surface, although somewhat mottled in character, from the hair varying in colour at base and apex.

The BoDy of the Angwúntibo is slender, and measures 101 inches in length from the point of the muzzle to the extremity of the very short tail, which is completely hid in the long fur of the body, and measures only about 4th of an inch in length. This animal is a male; the penis, which is supported apparently by a small bone, projecting upwards and forwards from the rounded scrotum.

The HEAD is oval and rounded, tapering rapidly in front of the eyes; the muzzle protruded, full or blunt, and rather prominent. The breadth of the head, in front of the ears, is about 1 inch; in front of the eyes, about 3ths of an inch. The length from the mesian line of the nose to the anterior part of meatus of ear is 13 inches; from point of nose to anterior angle of the eye is 3ths of an inch; from anterior angle of eye to front of opening of ear, 14 inch, the total length of head from muzzle, to back part, being nearly 21

1849 (Mammalia, &c., with Notes, by Edward Blyth), shows no such conjunction of the first phalanges, but three distinct phalanges are figured to each of the fingers.