Catalogue of the Mollusca of Staten Island, N. Y. 153 



*H. thyroides Say. *H. lineata Say. 



*H. tridentata Say. *Succinea avara Say. 



f H. hirsuta Say. *g_ aurea Lea. 



*H. pulchflla Mull. *S. ovalis Gould non Say. 



*H. labyrinthica Say. ' S. obliqua ? Say. 



*H. alternata Say. S. ? 



*H. striatella Anth. fTebennophovus Caroliniensis Binn. 



*H. minuscula? Biuney. *Limax agrestis Linn. 



*H. arborea Say. fLim;ix eampestris? Binn. 



*H. electrina Gould. *Melampus bidentatus Say. 



f H. indentata Say. *Alexia myosotis Drap. 



f H. cbersina Say. • fCarychium exiguum Say. 



fH. suppressa Say. 



Notes hy Sanderson Smith. 



Pecten irradians is exceedingly scarce on Staten Island, not- 

 withstanding its abundance on other parts of our coast, south 

 and east. 



The same may be said of Cardium Mortoni, of which, 

 indeed, the occurrence on Staten Island is still doubtful. 



The shell marked as Cardita horealisf is about one-eighth 

 of an inch in diameter, and neither the late Mr. Win. Cooper 

 nor myself could find any essential difference from the young 

 of that species. As, however, the sam,e species occurs both at 

 Greenport and Huntington, Long Island, of the same size only, 

 and in all these cases, in localities where the adult shell has 

 never been found, it seems possible that it may prove to be 

 different. 



Mya arenaria was once found by Mr. Wm. Cooper and 

 myself imbedded in numbers in a large log of wood, in holes 

 a foot deep and half an inch in diameter, each of which con- 

 tained from five to ten specimens. As the shells were nearly 

 as wide as the holes in which they were contained, and as in 

 most cases the holes, though near the surface of the log, had 

 no apparent connection with the exterior except at their 

 months, it° seems difficult to conceive how the shells at the 

 bottom of the holes could support existence. Nearly all, how- 



