JP/.JT. 





Cycla.s rivicola.. 

 C. cornea. 

 C.larustris . 



4 . C. lacustris . 



5 . Pisidrom azxmicum 



6 . P. Henslawiannm. 



7 . P. jni HiTn-rm . 



8 Anodon cygneno-S. 



