QUATERNARY FOSSILS. 329 



It did not differ from drift shells found at Brunswick, 

 Maine. This shell, as it occurs fossil, is thicker, more 

 ponderous, more equilaterally triangular ; the beaks are 

 directed more anteriorly, the teeth are much larger, and 

 the lunule broader and shorter, than in A. Banksii. 



Astarte compressa Linn. (^A. elliptica Brown.) 

 Common in all the beds, but not so abundant as A. 

 Banksii. 



Cardita borealis Conn Very abundant with the pre- 

 ceding. 



Macoma sabulosa Morch. ( Tellina proxima Brown.) 

 Of frequent occurrence. 



Cyrtodaria siliqua Daudin. Several valves at Caribou 

 Island. 



Panoptza norve£-ica Sprengel. A perfect valve of this 

 shell occurred at Caribou Island. 



Mja truncata Linn. Both the short and common 

 elongated varieties of this species occurred, especially at 

 Hopedale, in great profusion. 



Saxicava arctica Desh. Large valves occurred in 

 great profusion in all these beds. 



Chiton marmoreiis O. Fabr. Several valves were 

 found at Hopedale. 



Acmaea testudinalis (Miill.). One specimen occurred, 

 encrusted with Nullipora. 



Lepeca cceca Moll, {P. Candida Couth. ; P. cerea 

 MOller, Reeve.) Frequent. 



Puncturella noachina (Leach). {Diadora noachina 

 Gray.) Frequent. 



Margarita cinerea (Couth.). One specimen. Hope- 

 dale. 



