EXPLANATION OF PLATE XVL 



Outline drawings illustrating the sculpture of shells of the Shan species 

 of Taia. The line between the two views of each shell shows the 

 actual length. 



Taia theobaldi (Kobelt). 



Fig. 1. — Living shell from the Yawnghwe plain. 



Taia obesa, sp. nov. 

 Fig. 2. — Type-specimen from Hsin-Dawng caves. 



Taia naticoides (Theobald). 



Figs. 3, 4. — Shells of the Yawnghwe phase. 

 Figs. 5, 6. — Shells of the He-Ho phase. 



Taia intermedia, sp. nov. 

 Figs. 7, 8, 9. — Shells from superficial deposits on the He-Ho plain. 



Taia shanensis (Kobelt). 

 Fig. 10. — Shells from the Marginal Zone of the Lile Lake, 



