EXPLANATION OF PLATE VIIL 



The line beween the two views of each shell shows the actaal 

 height of the specimen. 



Limnaea andersoniana, Nevill. 



Fig. I. — Type-specimen (pond-phase) from Nantin, Yunnan 

 (Andeyson). 



Figs. 2, 3. — Shells of the intermediate phase from a pool at 

 Dimapur, Assam. 



Fig. 4. — -Shell of stream-phase from the ;\Ianipur Valley, 

 Assam. 



,, 5. — Shell of same phase from Yarkand {Stolic:ka). 



,, 6. — Shell of hill-stream phase from the Pagla Nadi near 

 Bishenpur, Manipur. 



