PLATE XXXI. 



Fig. I. Hcmiplecta kangeangetisis n. sp. 



Fig. 2. Plixtotropis kangcangcnsis n. sp. 



Fig. 3. Rettisa Sibogae n. sp. 



Fig. 4. Voliitopsis ancillarioides 11. sp. 



Fig. 5. Meloscaphander Sibogae n. sp. 



Fig. 6—8. Gizzard plates of same, a, c. inner side, b, d. outer side of large 



plates; t'. inner side, ƒ, g. latcral views of small plate. 

 Fig. 9. Tooth of radula of same. 



Fig. 10. Scaphandcr Sibogae n. sp. 



Fig. II. Scaphander attenuatus n. sp. 



