ZOOLOGY.— ^SEA-SNAIL. 543 



Oniscus Ceil, (Lin.) Larunda Ceti (Leach.) 

 Whale's louse. — This little animal, ahout half an 

 inch in diameter, firmly fixes itself by its hooked 

 claws, on the skin of the mysticetus. It is found 

 principally under the fin, or in other situations 

 where the skin is tender, and where it is not liable 

 to be dislodged. A similar animal, but smaller, is 

 sometimes found on the body of the narwal. 



Class VERMES. 



ASCARIS, ECHINOKHYNCHUS, T^NIA, &C. In- 



testina. — Found in various animals inhabiting the 

 northern seas. 



AsciDiA gelatinosa and A. rustica. — Taken by 

 Captain Phipps, in a trawl on the north side of 

 Spitzbergen. 



Lern^a h7'anchialis. — Found by Captain 

 Phipps in the gills of the Cyclopterus liparis. 



Clio helicina. (Phipps, p. 195.) Sea-snail. — 

 An animal covered with a delicately beautiful shell, 

 similar in form to that of the nautilus. The dia- 

 meter is from two-eighths to three-eighths of an 

 inch. It is found in immense quantities near the 

 coast of Spitzbergen, but does not, I believe, occur 

 out of sight of land *. 



• See Fig. 11, and 12. of PI. XVI. In these figures, this 

 animal is magnified to about twice the naturd size. 



H 



