PLATE XXXI. 



I. Heiniplecta kangeangensis n. sp. 

 Plectotropis kangeangensis n. sp. 

 Ret us a Sibogae n. sp. 

 Volntopsis ancillarioides n. sp. 

 Meloscaphander Sibogae n. sp. 

 —8. Gizzard plates of same, a, c. inner side, b, d. outer side of large 



plates ; e. inner side, /, g. lateral views of small plate. 

 Tooth of radula of same. 

 Fig. lo. Scaphander Sibogae n. sp. 

 Fig. ir. Scaphander atteniiatus n. sp. 



Fig. 



I. 



Fig. 



2. 



Fig. 



3- 



Fig. 



4- 



Fig. 



5- 



Fig. 



6- 



Fig. 



9- 



