On the MoUusca of Long Island. 153 



quarter tlie length of the shell, regularly tapered, not very- 

 slender. Eyes minute, between and a little behind the ten- 

 tacles. Foot rounded behind, expanded and horned in front, 

 about half the length of the shell. 



24. Chemnitzia inter rupta Stimpson. On two different occa- 

 sions, half a dozen living, and two or three times as many dead 

 specimens were dredged in four or five filths, sand. l!^umerous 

 living specimens occurred in two fathoms mud on one occasion. 

 A few other dead specimens occurred in other dredgings. All 

 the larger specimens had twelve or thirteen whorls, whilst Gould 

 gives only eight or ten, probably describing from young speci- 

 mens. The largest were about .35 inch in length. 



25. Scalaria clathrus Linn. One dead specimen picked up 

 on the beach. 



26. Scalaria lineata Say. Two dead specimens. 



27. Cerithium Sayi MenJce. Extremely abundant. At low 

 water mark, under stones, and in the hollow of dead shells, with 

 Chemnitzia irijida. Also in mud at two faths. Great accu- 

 mulations of dead shells are often found in sheltered situations, 

 containing many of the rarer species, as Columhella lunata, C. 

 Gouldiana^ Pleurotoma pUcatum^ P. cerinuin^ Chemnitzia pro- 

 duda^ C. fusca^ C. trifida^ Cerithiopsk Emersonii^ Cer. tere- 

 hellum^ Acteon pimctostriata^ Bulla canaliculata, <&c., besides 

 many specimens of Ve7vus geinma and Rissoa minuta. The 

 animal is greyish-black. Foot dark grey above, greyish-yellow 

 below, narrow, rather more than one-third the length of the 

 shell. Muzzle white. Tentacles white, with black bands. Eyes 

 black, at outer bases of tentacles. "When in confinement, the 

 animal frequently floats with the foot upwards, like Columhella 

 lunata. 



28. CeritJiium 7iigrocinctum Adams. Rare. Low water to 

 ten faths. 



29. Cerithium Greenii Adams. Rare. At low water mark 

 on Txibularia larynx., attached to piles. (See Columhella lunata.) 



30. Cerithiopsis Emersonii Stimpson. Moderately abundant, 



