1856.] 279 



Gen. PALUDINA. 



P. MULTiLiNEATA, Meek and Hayden, Proc. Acad. N. S. Phila. vol. 8, p. 120 



P. VETUiiA, Meek and Hayden, " " " " 121 



P. Leah, Meek and Hayden, " " " 



P. EETUSA, Meek and Hayden, " " " " 122 



P. CoNRADi, Meek and Hayden, " " " 



P. PECULiARis, Meek and Hayden, " " " 



P. TROCHiFOEMis, Meek and Hayden, " " " 



P. Leidyi, Meek and Hayden, " " " 



123 



Gen. MELANIA. 



M, MiNUTULA, Meek and Hayden, Proc. Ac. Nat. Sc. Phila. vol. 8, p. 123 

 M. Anthonti, Meek and Hayden, " " " " 124 



M. MULTisTRiATA, Meek and Hayden, " " " " " 



M. Nebrascensis, Meek and Hayden, " " " " " 



M. CONVEXA, Meek and Hayden, " " " " 125 



Gen. VALVATA. 

 V. PARVULA, Meek and Hayden, Proc. Acad. Nat. Sc. Phila. vol. 8, p. 123 



Gen. CERITHIUM. 

 C. Nebrascensis, Meek and Hayden, Proc. Ac. N. S. Phila. vol. 8, p. 125 



Gen. CYCLAS. 



C. FORMOSA, Meek and Hayden, Proc. Acad. Nat. Sc. Phila. vol. 8, p. 115 

 C. FRAGiLis, Meek and Hayden, " " " " " 



C. suBELLiPTicus, Meek & Hayden, " " '< " " 



Gen. CYRENA. 



C. MoREAUENSis, Meek and Hayden, Proc. Ac. Nat. Sc. Phila. vol. 8, p. 115 

 0. INTERMEDIA, Meek and Hayden, " " " " 116 



C. occiDENTALis, Meek and Hayden, " " " " " 



Gen. CORBULA 



C. suBTRiGONALis, Mcck & Hayden, Proc. Ac. Nat. Sc. Phila. vol. 8, P. 116 

 C. PBRUNDATA, Mcck and Hayden, " " " " " 



C. MACTRiFORMis, Mcck and Hayden, " " " " 117 



Gen. UNIO. 



U. PRiscus, Meek and Hayden, Proc. Acad. Nat. Sc. Phila. vol. 8, p. IIY 



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