1871.] G. and H Nevill — Descriptions of new Mollusca. 11 



company with a species of Pholas ; there appears to be no specific 

 difference from the shell figured from New Caledonia by Mr. 

 Souverbie from a unique specimen ; my specimen confirms his 

 statement, that the right valve is less inflated than the left one, 

 which he appears to have thought might have been only accidental 

 in his type specimen ; he makes no remark regarding the habitat. 



Description of Plate. 



Fig. 1. — [b. Leptoconchus Robillardi, p. 5. 



2. — 2a. Cylichna la-ctuca, p. 2. 



3. — 3a. Cylichna involuta, p. 3. 



4. — 4cZ. Pisidium Clarkeanum, p. 9. 



5. Robinsonia Ceylonica, p. 4. 



6. — 6a. Robinsonia pusilla, p. 3. 



7. — 7a. Cataulus Nietneri, p. 7. 



8. — 8a. Helicina Theoboldiana, p. 8. 



9. — 9a. Fossarus ins ignis, p. 4. 



10. — 1GX Fossarus Stoliczlcanus, p. 4. 



11. — lie. Nucula Rabaniana, p. 9. 



12. — 1 2a. Ringicula apicata, p. 3. 



13. — \Zb. Glauconella Anderso^ii, p. 2. 



14. Niso pyramidelloides, p. 5. 



15. — 15a. Mangelia bicinctula, p. 6. 



16. — 16a. Cryptogramma Ara/cana, p. 10. 



17. Gibbulina Adamsiana, p. 17. 



18. Gibbula Holdsworthana^. 3. 



19. Syrnola dubiosa, p. 5. 



20. — 20a. Cypricardia spathulata, p. 10. 



