On the Mollusca of Long Island. 167 



eluding two doubtful identifications, all of wliich have been, or 

 are likely to be found, in the Canadian waters. 



In the Glacial beds of Northern Europe twenty-five species 

 occur, including five doubtful identifications, all of which, 

 except Bicccinum jjlicosum, Leda teniiuulcata (both of which 

 are doubtful identifications), and Aphrodite Groenlandica are 

 now living there. 



In the Pliocene of South Carolina occur thirty-one species, 

 all of which, except Natica heros, Leda Umatula, and Cytherea 

 convexa, are now living there. 



In the English Hed Crag occur eight species, inclaclmg two 

 doubtful identifications, of which only Leda tenuisulcata 

 (doubtfully identified) and Aphrodite Groenlandica are not now 

 inhabitants of Europe. In the Miocene of IST. Carolina, Virginia, 

 and Maryland, fifteen species occur, all of which, except Natica 

 heros, Pecten Magellanicus, Mytilus decussatus, and Mytilus 

 modiolus^ are now living on these coasts, and some of the ex- 

 ceptions are probably only due to the imperfect lists at my 

 command. 



In the English Coralline Crag seven species occur, including 

 one doubtful identification, all of which are living European 

 species. 



Forty-nine species are apparently at or near the northern 

 extremity of their range ; thirty-two at or near the southern 

 extremity of it. Seventeen extend from S. Carolina or Florida 

 to the Gulf of St. Lawrence or farther north, passing through 

 the entire length of the Atlantic and Boreal Provinces into the 

 Arctic Province. Twenty-five range along the whole coast of 

 New England, or for a short distance only on each side of Cape 

 Cod, so that Greenport may be considered as not far from 

 the middle point of their range. Six are found only at one 

 locality, or range only between New York and Cape Cod. 

 Twenty-four are found living in Europe, including one or two 

 doubtful identifications. 

 APRIL, I860. 12 ^^'^' ^"^*'" ^^'^' ^^"^^ ^°^* ^^^° 



