366 APPENDIX. 
Ciio BoREALIS. 
C. gelatinosa, pellucida ; pinnis subtriangularibus; cauda acuta. 
Clio Borealis, Pallas, Spicil. Zool. 10. p. 28. t. 1. f. 3-4; Brug. En- 
cycl. Méthod. pl. 75. f. 3-4; Lam. Hist. Nat. des Anim. sans Vert. 
vil. 288; Cuv. Reg. Anim. uu. p. 379; Leach, Ross, Voyage to 
Baff. Bay, Suppl. 
Clio retusa, Fabr. Faun. Gren. p. 334. no. 324. 
Clio limacima, Phips. C. Ellis, Zooph. p. 15. no, 324. 
Habitat in oceano Boreali vulgatissime. 
Animal gelatinous, pellucid; fins somewhat triangular; tail acute. 
This species is extremely common in the Northern seas, and forms 
the principal food of the cetaceous animals. 
In 1811, during a tour made by me to the Orkneys with some 
friends, I observed on the rocks on that side of the Isle of Staffa, 
several mutilated specimens of this animal: the three previous days 
had been extremely stormy, so as to confine us to the isle Colunsa. 
Some days afterwards I borrowed from a fisherman a large shrimp- 
net ; and on rowing along the coast of Mull, when the sea was calm, 
after many vain efforts I was at last enabled to capture one of them 
alive: this specimen is in that part of the Zoological Collection 
which I presented to the British Museum. 
CLASSIS III. GASTEROPODA. 
Gasteropoda, Cuvier, Lamarck. 
Vermes testacea, Linneus. 
Corpus pallio instructum, nudum aut testa una imterna aut externa 
instructum. Caput tentaculis duobus aut quatuor imstructum ; in 
generibus nonnullis oculi, labium, lingua et mandibule mvyeni- 
untur, in perpaucis desunt. Os sepius carnosum et durum est. 
Branchié in nonnullis externe, in aliis mternze, structura et forma 
valde variantes. Pes ventralis locomotionis organum est, per 
corporis superficiem inferiorem plus aut minus adherens. Sewxus 
distinctus, perfectus, hermaphroditus aut androgynus. Genera 
nonnulla sunt ovipara, ovo-vivipara aut vivipara. 
