162 On the Mollusca of Long Island. 



much longer than the preceding species, blackish brown out- 

 side, and lead color inside, I refer, with some doubt, to this 

 species. 



69. Cardita horealis Conrad. A few very small dead speci- 

 mens were dredged, at different times, in Gardiner's Bay. 



TO. Cardium Mortoni Conrad. Extremely abundant in the 

 mouths of creeks and on shallow flats, from low water mark to 

 two faths. The markings are finer and more varied than I 

 have ever seen in specimens from other localities, some speci- 

 mens being entirely of a dark fawn color, whilst others are com- 

 pletely white. The zigzag markings frequently occur in great 

 perfection, even on specimens of the largest size. Specimens 

 sometimes occur entirely devoid of the internal purple blotch, 

 which Dr. Gould states to be the only invariable mark of dis- 

 tinction from Card. Icevigatum of the West Indies. The 

 species is most abundant and finest in a long narrow bay on 

 Shelter Island, which divides the two baj'^s, now called Code's 

 Harbor, but which, on an old map of Long Island, I find called 

 Cockle Harbor, probably from the abundance of this shell. The 

 animal is white and has short conical siphons, each marked with 

 a circle of brown spots. The foot can be extended to three 

 times the length of the shell. The siphonal extremity is fringed 

 with numerous cirri, which extend a good deal beyond the 

 shell. 



Tl. Cardium pinnulatum Conrad. Several dead pairs and 

 single valves (very fresh) were dredged on two occasions in 

 Gardiner's Bay, and a single very small dead pair in Peconic 

 Bay. 



72. Astarte mactracea Linsley. Dead pairs and single valves 

 are abundant in every dredging from five to ten faths. but I 

 have never obtained it alive. 



T3. Venus mercenaria Linn. Moderately abundant. 



T4:. Yenus gemma Totten. Yery abundant. (See remarks 

 on Itissoa minuta and Cerithium Sayi.) Alive in two faths. 

 mud, with Cer, Sayi, JVassa ohsoleta, Mactra lateralis, and great 



