NORTH AMERICAN CONCHOLOGT. 165 



Anatinidae. 



22 Anatina papyracea Say. 



22 Cochlodesma Leanum CoMiA. 



Anatina Leana Couth.. 



22 Thracia truncata Mighels. 



23 Couthouyi St. 

 23 Conradi Couth. 



Pandoridae. 



23 Lyonsia hyalina Conr. i 23 Pandora trilineata Say. 



Osteodesma hyalina Conr. | 



Corliulidse. 



24 Corbxila contracta Say. 



Myadae. 



24 Glycymeris siliqua Lam. 



Mya siliqua Chemii. 

 24 Panopeea Norvegica Lov&n. 

 2Iya Norwegica Spengl. 



P. arctica Desh. 

 24 Mya truncata Linn. 

 24 arenaria Linn. 



Gastrocliaenidae. 



24 PetricolapholadiformisZ/am. 



P. fornicdta Say. 



24 dactylus Say. 



25 Saxicava arctica Desh. 



2Iya arctica L. 



S. distorta Say. 

 25 Saxicava rugosa Lam. 



Mytilus rugosiis 0. Fabr. 

 S. distorta Say. 



Pboladidae. 



25 Pholas costata Linn. ] 25 Pholas crispata Linn. 



25 truncata Say. | 26 Teredo dilatata »S^ 



GASTEROPODA. 

 PTEROPODA. 



Ilyaleadae. 



27 Hyalea trispinosa T^esueur. 



Limacinadae. 



27 Spinalis Gouldii St. (pi. i, fig. 4). 



Clionidae. 



27 Clione borealis Gray \ Clio borealis Linn. 



PROSOBRAIVCHIATA. 



Dentaliadae. 



28 Dentalium striolatam St. I 28 Dentalium occidentale St. 



D. entalis Migh. | D. dentale Gould. 



