On the Mollusca of Long Island. 159 



The foot has an appendage in front, slightly liorned, which can 

 be extended as far as the base of the tentacles. 



43. Crepid'ula convexa Say. Abundant. Low water to 10 

 fathoms. Animal dark grey, except the tentacles and end of 

 muzzle, which are white. 



44. Crepidula unguiformis Lamarck. Abundant. Low 

 water to 10 faths. Grows to the length of Ifo inches, and is 

 frequently very rough-looking, appearing like small oysters. 

 Specimens from the upper side of large stones are extremely 

 thin and smooth. The animal is white. 



45. Teciura testudinalis Gray. Moderately abundant. Low 

 water. The animal is white. Foot regularly elliptical. Ten- 

 tacles very long and slender, nearly two-thirds the length of 

 the shell. Eyes sessile at outer bases of tentacles, and a little 

 beneath them. Gill white, about one-fifth the length of the 

 shell. Head rounded, showing the brown horny jaw in the 

 centre. The fringed margin of the mantle extends beyond the 

 shell all round. The shell does not attain a large size here, the 

 longest having a length of seven-tenths of an inch, and few 

 exceeding half an inch. 



46. Chiton apiculatus Say. Moderately abundant. Four 

 to ten fathoms. 



Pulmonirera. 



47. Melamjpus corneus Stimpson. Yery abundant. 



Tectibranchiata. 



48. Acteon punctostriata Stiirt/pson, Rare. Dead specimens 

 occur amongst the accumulations of Cerithium Sayi, and Venus 

 gemma. 



49. Bulla solitaria Say. Rare. In mud at two fathoms, 

 with Rissoa m,inuta, and Venus gemma. Animal light grey- 

 ish, spotted with light grey. 



50. Bulla canalicidata Gould. Not so rare as preceding 



