On the Mollusca of Long Island. 151 



ceding species, tlie upper surface being covered with small 

 slate-colored spots on a nearly white ground. Foot white 

 below, nearly as long as the shell, horned in front, and with 

 two tentacular filaments behind; whilst in ^. olsoleta it is 

 bluntly pointed behind, and not so narrow. Tentacles about 

 one-third the length of the shell, bearing the black eyes on 

 their upper side, at the first third of their height, and narrow- 

 ing suddenly beyond them. Trunk mottled like body, capable 

 of being extended half the length of the shell beyond it. — 2 

 to 10 faths. 



8. Colwmlella avara Say. Moderately abundant. Low water 

 (on piles of a pier), to 10 faths. 



9. Columhella Gouldiana Agassis. Several dead specimens, 

 considered by Mr. Wm. Cooper to belong to this species, 

 occurred amongst accumulations of Cerithium Sayi, and Ve7ius 

 gemma. 



10. Columhella lunata Sowerby. Moderately abundant. The 

 animal has a conspicuous grey siphon, more than half the 

 length of the shell. Foot white below, very narrow, capable 

 of being extended to the full length of the shell. Eyes near 

 base of tentacles. When in confinement, it often floats at the 

 surface of the water with the foot upwards. Very active. In 

 mud and sand from low water to 10 faths. Numerous speci- 

 mens were found in November crawling on Tuhidaria larynx 

 attached to the piles of a pier, below low water mark, in com- 

 pany with C. avara, Cerithium Oreenii, C. nigrocinctum, 

 C. Sayi, Nassa trivittata, N. ohsoleta, and Littorina rudis. 



11. Pleurotoma cerinwn Kurtz (& Stimp. Kare. Only dead 

 shells found. 



12. Fleurotoma plicatinn Adams. Not so rare as the pre- 

 ceding. The animal has the foot white below, not very nar- 

 row, capable of being extended to two-thirds the length of the 

 shell. Tentacles short, bearing the eyes near their extremity, 

 and suddenly narrowing beyond. Siphon yellowish, short. In 

 two faths. mud, and dead amongst accumulations of Cer. Sayi, etc. 



APKIL, 1860. 11 ^^- ^^^' ^^'^' ^^^' ^°^' ^^^' 



