Mactradae. 



* Mactra solidissima, Ch. 

 Mactra ovalis, (1U1. 

 Mactra lateralis, Say. 

 Cumingia tellinoides, Conr. 



* Ceronia arctata, Conr. 

 Ceronia deaurata, Turt. 



Kelliadae. 

 Kellia planulata, Stm. 



* Kellia suborbicularis, Mont, 



* Turtonia minuta, 0. Fabr. 



* Montacuta elevata, Stm.» 



Oastrochaenidae. 



* Saxicava rugosa, Penn. 



* Saxicava arctica, Lin. 



* Petricola pholadiformis, Lam. 

 Petricola dactylus, Say not Slij. 



Telliiiidae. 



Mac o ma fuse a, Say. 



* Macotna proxima, Gray. 

 Tellina tenta, Say. 

 Tellina tenera, Say. 



L.iicmidae. 



* Lucina filosa, 5"^ 



* Lucina dentata, Wood. 

 Cryptodon Gouldii, Ph. 



Cycladidae. 

 Sphcerium simile, Say. 

 Sphasrium partumeium, Say. 

 Sphaerium rhomboideum, Say. 



* Spheerium Vermontanum, Prime. 



* Sphaerium truncatum, LInsley. 



* Sphaerium tenue. Prime. 



* Sphaerium securis. Prime. 



* Sphaerium occidentale. Prime. 

 Pisidium dubium. Say. 



* Pisidium Adamsii, Prime. 



* Pisidium compressum, Prime. 



* Pisidium equilatere, Prime. 



* Pisidium ferrugineum, Prime. 



* Pisidium abditum, Hald. 



* Pisidium variabile. Prime. . 



* Pisidium ventricosum, Prime. 



