EXPLANATION OF PLATE XIX. 



Bivalve shells from the Inle basin. All the figures except figs. 13 and 

 14 are slightly below the natural size. Figs. 13 and 14 are greatly 

 enlarged. 



Physunio micropteroides, sp. nov. 



Figs. 1-3. — Type series from the Yawnghwe river. 



Physunio ferrugineus, sp. nov. 



Figs. 4-9. — Series from the Central Region of the Inle Lake, illustrating 



growth of shell. 

 Figs. 10, 11. — Old shells from the same part of the lake. 



(In old shells the posterior exposed ivAvt of the valves is always covered by a 

 rather dense growth of algae). 



Corbicula noetlingi, v. Martens. 

 Fig. 12. — Shell from Yawnghwe river. 



Pisidium casertanum (Poli). 



Fig. 13. — Shell from the Central Region of the Inle Lake. Length 3-5 



mm. 

 Fig. 14. — Shell from the ed<ie of the He-Ho stream. Length 3-75 mm. 



