486 
In large summer-dry ponds. 
Physa gyrina, Planorbis trivoluis, Planorbis parvus, Planorbis exacuous, 
Segmentina armigera, M usculium partumeium, Ancylus parallelus, 
Lymnaea reflexa. 
In small pools of very transient character. 
Lymnea caperata, A plexa hypnorum, Spherium occidentale. 
In the river, which does not run dry. 
Spherium stamineum, Musculium transversum, Lampsilis, Anodonta, 
Anodontoides, Physa gyrina, Planorbts trivoluis, Ancylus rivularis. 
Semiaquatic; on the edges of river and pools. 
Lymnea parva sterki. 
In brooks and overflow from river. 
Lymnea caperata. 
