MBLVILL — MAEINE MOLLUSCA. 77 



4. Olyphis singaporensis (Reeve). 



Fissurella singaporensis, Reeve, Conch. Icon. vi. Fissurella, fig. 100, 101. 

 Log. Chagos Archipelago : Salomon I. 

 Coetivy I. 



Family EmarginulidsB. 



5. Emarginula clathrata, Ad. & Rve. 

 Loc. Chagos Archipelago : Salomon I. 



6. Emarginula tenuicostata, Sow. 



Loc. Saya de Malha Banks : Station C 9, 145 fathoms, shell-rubble. 



Coetivy I. 

 One example only was dredged at either place. 



7. Simula exquisita, A. Ad. 

 Loc. Amirantes : St. Joseph. 



A very delicate and refined species, whose headquarters are the Philippine Islands. 



Family HaliotidSB. 



8. Haliotis pustulata. Reeve 



Loc. Saya de Malha Banks : Station C 16, 26 fathoms, with the preceding. A young 

 shell only, but agreeing in both sculpture, form, and coloration with tlie Mauritian species. 



9. Haliotis (Fadollus) ovina, Chem. 



Loc. Chagos Archipelago : Coin I., Peros Banhos. 



Saya de Malba Bank : Station C 16, 26 fathoms, among living corals and rubble. 



Sect. ii. AZTQOBRANCHIATA. 



Family StomatellidsB. 



10. Stomatella angulifera, A. Ad. 



Loc. Amirantes: Station E 11, 25-80 fathoms, hard ground. Also Station E 13, 

 20-25 fathoms, Halimeda-vMbhlQ. 



11. Gena auricula (Lam.). 

 Loc. Seychelles I. 



12. Gena nigra (Quoy). 

 Loc. Coetivy I. 



13. Gena sirigosa, A. Ad. 



Loc. Chagos Archipelago : at low tide, Barachois Maurice, south of Diego Garcia. 



