EXPLANATION OF PLATE XIL 



Direct photographs of shells of Melania and AtnpuUaria ; natural size. 



Melania tuberculata, Miiller. 



Fig. 1. — Living shell from Tnle Lake. 



Fig. 2. — Large subfossil shell from He-Ho plain. 



Melania baccata (Gould.). 



Figs. 3, 3a. — Type-specimen of the var. elongata from swamp on He-Ho 



plain. 

 Figs. 4, 5. — Living shells of small phase from the Yawnghwe river. 

 Figs. 6, 7. — Subfossil shells from He-Ho plain. 



Melania variabilis, var. 

 Fig. 8. — Fossil shell from cave deposit at Hsin-Dawng. 



Melania terebra, Benson. 

 Fig. 9. — Living shell from the Yawnghwe river. 



Ampullaria winkleyi, Pilsbry. 



Fig. 10.- — Small shell showing periods of growth from the Yawnghwe 

 river. 



