Family II.— UNIONID/E. 



Genus I.— Unio, PJiilippsson. 

 Unio tumidus, Phil. 



Unio tumidus, v radiata, Colb. 



Unio tumidus, v ovalis, Mont, 

 Unio pictorum, Z. 



Unio pictorum, v radiata, Moq. 



Unio pictorum, v curvirostris. Norm. 



Unio pictorum, v latior, Jeff. 



Unio pictorum, v compressa, Jeff. 

 Unio Margaritifer, L. 



Unio margaritifer, v sinuata. Lain. 



Unio margaritifer, v Roissyi, Mich. 

 Genus II.— Anodonta, Lam. 

 Anodonta cygnea, Z. 



Anodonta cygnea, v radiata, Miill. 



Anodonta cygnea, v incrassata, Shepp. 



Anodonta cygnea, v Zellensis, Gmel. 



Anodonta cygnea, v pallida, Jeff. 



Anodonta cygnea, v rostrata, Rossm. 

 Anodonta anatina, Z. 



Anodonta anatina, v radiata, Jeff. 



Anodonta anatina, v ventricosa, Pfeiff. 



Anodonta anatina, v complanata, Rossm. 



Family ML— DREISSENID/E. 



Genus Dreissena, Van Beneden. 

 Dreissena polymorpha, Pall. 



Class II.— GASTEROPODA. 



Order I. PECTINIBRACHIATA. 



Family L— NERITID/C. 



Genus Neritina, Lam. 

 Neritina fluviatilis, Z. - 



Neritina fluviatilis, v trifasciata, Colb. 

 Neritina fluviatilis, v undulata, Colb. 

 Neritina fluviatilis, v cerina, Colb. 

 Neritina fluviatilis, v nigrescens, Colb. 



