VALVATA TR\CARlNATA 



VIVIPARUS CONT tCTOI O ES 



TULOTOMA nAC-N»FlCA 



OVROTOnA /\MPLUf-l NER.T.NA RECtiVATA 



CAMPELOMA PONOEROSUM 



LITHASIA ARMlG-ERA 



EUR^CAtLON AMTHON'ft 



\ O FUUV \ A L » S 



&0N\08ASlS viRC-lNUA Ar^CULOSA PRAEROSA 



PLEUROCERA ACUTA 



121 



