112 CLASS IX. ORDER X 



DORIS, (sea-lemon,) body creeping, oblong, and 

 flat beneath ; mouth placed below on the fore- 

 part ; vent behind on the back, surrounded by a 

 fringe ; feelers 2 to 4, seated on the upper part of 

 the body in front and retractile within their proper 

 receptacle. 



TRITON, (water salamander,) body oblong ; 

 mouth with an involute spiral proboscis ; tentacu- 

 las or arms twelve, six on each side, divided near- 

 ly to the base, the hind ones cheliferous. 



TETHYS, body detatched, rather oblong, fleshy, 

 without peduncles ; mouth with a terminal cylind- 

 ric proboscis under an expanded membrane or lip : 

 apertures two on the left side of the neck. In sea. 



LAPLISIA, (sea-hare,) body creeping, covered 

 with reflected membranes, with a membranaceous 

 shield on the back, covering the lungs ; aperture 

 placed on the right side ; vent above the extremi- 

 ty of the back ; feelers four, resembling ears. In 

 sea. 



ScYLLAEA,body compressed and grooved along 

 the back ; mouth consisting of a terminal, toothless 

 aperture ; tentacula or arms three each side, and 

 placed beneath. In sea. 



LIMAX, (slug, smooth snail,) body oblong, creep- 

 ing, with a fleshy kind of shield above, and a lon- 

 gitudinal flat dish beneath ; aperture placed on 

 the right side within the shield ; feelers four, si- 

 tuated above the mouth, with an eye at the tip of 

 each of the larger ones. In water, moist places, 

 and on common soil. 



SALPA,body loose, nayant, gelatinous, tubular, 

 and open at each extremity 5 intestine placed ob- 

 liquely. In sea, 



