EXPLANATION OF PLATE XVIII. 



Embryonic shells, etc., of Shan species of Taia. 



Taia naticoides (Theobald). 



Fig. L — Operculum, X 1|. 

 Fig. 2. — Radular teeth, x62|. 

 Fig. 3. — Embryonic shell, x3, 



Taia shanensis (Kobelt). 



Fig. 4. — Operculum, x 1|. 

 Fig. 5. — Embryonic shell, x3. 

 Fig. 6.— Raduiar teeth, x 62^. 



Taia lacustris, sp. nov. 



Figs. 7, 8.— Embryonic shells, x 3. 

 Fig. 9.— Young shell, x2. 



Taia intha, sp. nov. 



Fig. 10. — Embryonic sheli, x3. 

 Fig. 11.— Radular teeth, x62|. 

 Fig. 12. — Operculum, x 1|. 



Taia elitoralis, sp. nov. 



Fig. 13. — Operculum, xl|. 

 Fig. 14.— Radular teeth, x62i. 



Taia theobaldi (Kobelt). 



Fig. 15. — Embryonic shell, x3. 

 Fig. 16.— Radular teeth, x62|. 

 Fig. 17. — Operculum, x 1|. 



