Oldalképek
PDF
ePub
[merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small]

PRINTED BY JOHN BROWN, ANCHOR CLOSE,

FOR THE PROPRIETORS,
AND SOLD BY ALL THE BOOKSELLERS IN THE UNITED KINGDOM.

1816,

[ocr errors][ocr errors]
[ocr errors]

33 20 10 9
OT OZ TS OT 06
NEWTONIAN PHILOSOPHY
N°1

NO. 2
p2

K
n

M
D
IB

B В
Nocturnal.
F 28

TODES
R

E

G
TEV

[graphic]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]
[ocr errors]

ENCYCLOPÆDIA PERTHENSIS.

N E R

N ER NEREIS, in soology, a genus of animals

be pear as if on fire all around. Their bodies are fo longing to the order of vermes mollusca. The minute as to elude examination by the naked eye. body is oblong, linear, and fitted for creeping; See fig.s. It is sometimes called nereis phospheit is furnished with lateral pencilled tentácula. rans; and is thus described by Griselin : The There are 11 fpecies, of which the most remark. head is roundish and fat, and the mouth acumiable are the five following:

nated. The two horns or feelers are short and 1. NEREIS CÆRULEA, the blue nereis, inhabits subulated. The eyes are prominent, and placed the ocean; where it destroys the serpulæ and on each fide the head. The body is composed teredines. See Plate CCXLVI, fig. 1.

of about 23 segments or joints, which are much 2. NEREIS CIRROSA, the waving nereis. See less nearer the tail than at the head. These fegfig. 2. The body is red, lumbriciform, with 65 ments on both sides the animal all end in a short notches, furnished on both sides with two rows cónical apex, out of which proceeds a little bunof bristles. At each side of the head ten filaments, dle of hairs; from under thefe bundles the feet at the fides of the mouth many, twice as long grow in the form of small flexile subulated regas the former. It dwells in Norway, on rocks ments deftitute of any thing like claws. It is at the bottom of the sea. It vomits a red liquor, scarcely two lines long, is quite pellucid, and its with which it tinges the water.

colour is that of water green. They are found 3. NEREIS GIGANTÆA, the giant nereis, is a pe- upon all kinds of marine plants; but they often culiar species of those large worms that make leave them and are found upon the surface of the their way into decayed piles driven down into the water: they are frequent at all seasons, but espefea, which they bore through and feed upon, cially in summer before stormy weather, when whence they are called sea worms. From head they are more agitated and more luminous. to tail they are beset on either side with small tufts Their numbers, and wonderful agility, added to terminating in three points; which are like the their pellucid and shining quality, do not a little fine hair pencils used by painters, and composed contribute to their illuminating the sea, for myof shining bristles of various colours. The upper riads of those animalculæ inay be contained part of the body in this worm is all over-covered in the portion of a small cup of sea water. Innuwith small hairs. The rings of which it is formed merable quantities of them lodge in the cavities are closely presled together, and yield to the of the scales of fifhes, and to them probably do touch. The 3 rows of small tufts serve instead of the fishes owe their noctilucous quality. “I have feet, which it uses as fish do their fins. See fig 3. observed with great attention (says Barbut) a fish

4. NEREIS LACUSTRIS, the bog nereis. The just caught out of the sea, whose body was albody of the Gize of a hog's short bristles, transpa- most covered with them, and have examined them rent, as it were articulated, and 'on either side in the dark: they twist and curl themselves with at every articulation provided with a Mort seta. amazing agility, but soon retire out of our conceous foot; interiorly it seems to confift in a man- tracted fight; probably their glittering numbers net of oval-shaped articulations, and a back formed dazzling the eye, and their extreme minuteness by two lines bent backwards. See fig. 4. It in- eluding our researches. It is to be observed, that habits marshes abounding in clay, where it remains when the unctuous moisture which covers the under ground pushing out its other extremity by scales of fishes is exhaufted by the air, these ani. reason of its continual motion. When taken out males are not to be seen ; nor are the fishes then it twists itself up. It is frequent in Sweden. noctilucous, that matter being perhaps their non

5. NEREIS NOCTILUCA, the noctilucous nereis, rishment when living, as they themselves afford food inhabits almost every sea, and is one of the causes to many marine animals. They do not thine in the of the luminousness of the water. These crea- day-time, because the folar rays are too powerful tures shine like glow-worms, but with a brighter for their light; however aggregate or immense {plendour, so as at night to make the element ap- their number.” Their appearance is particular. VOL. XVI. Part I.

А

ly

« ElőzőTovább »