40 BULLETIN 37, UNITED STATES NATIONAL MUSEUM. 



Table II. B. — List of Pelecypoda — Continued. 



Name and authority for species. 



PI. 



Figs. 



Alt. 



or 



Lon. 



depth. 



Northern 

 extreme rana 



Genus MODIOLARIA Beck. 



M. nigra Gray - - . 



M. corrugata Stimpson 



M. lateralis Say 



Genus CRENELLA Brown. 



C. glaudiilaTotteii 



C. decussata Montagu 



C. divaricataOrbigny 



C. fragilis VerrlU 



Genus DREISSENSIA Van Ben. 



Subgenus Mytilopsis Conrad. 



M. leucopheata Conrad 



Suborder AKCACEA. 



Family ARCID^. 



Genus ARCA Linne. 



Section Arca Lamarck. 



A. nose Linn6 



A. imbricata Brugui^re 



Section Barbatia Gray. 



A. Candida Chemnitz 



A. 



A. ectocomataDall 

 A. barbata Liun6 



Section Noetia Gray. 



A. ponderosa Say 



A. Orbigny i Kobelt , 



A. Jamaicensis Gmelin 



Section Scapharca Gray. 



A. lienosa Say 



A. transversa Say 



A. Incongrua Say 



A. auriculata Lamarck 



Section Argina Gray. 



A. pexata Say 



A. Holmesii Kurtz . 

 110 I A. Americana Gray 



2 



9 



7,8 



10 

 136a 



14.0 



9,10 



26.0 



.56 



56 



16 



"6 

 Too 





70 



A 



Arctic Sea. , 

 Arctic Sea . . 

 Maine 



Arctic Sea.. 

 Arctic Sea. . 

 Hatteras ... 

 Chesapeake 



Maryland 



Hatteras 



Hatteras 



Hatteras 



St. Augustine 



N. Carolina., 



Cape Cod 



Texas , 



N. Carolina., 



Hatteras 



Cape Cod 



Hatteras — 

 Key West . . , 



Cape Cod 



Hatteras 



