78 RISSOlDiE. 



20. Rissoina plicata. 



Rissoina plicata, A. Adams, P. Zool. S. 1851, I. Masbate ; Schioartz, I. c.fig. 

 21 [ft/pical spec.2, long. 5'6, diam.2'5 mil.; var. = R. scalariana, A. 

 Ad. and R. beriheloti, Audouin. 



50 Andamans, Arakan, Kharg, Mauritius, Bourbon, Seychelles ; coll. W. 

 T. Blanford and G. Nevill, Esqrs. 



10 Ceylon ; coll. G. Nevill, Esq. [6,2f— apex perfect]. 



These Ceylon specimens approximate very closely to var. 

 R. bertheloti. 



1 Viti-Levu ; ex Mus. Godeffroy [as " E.firmata, C. B. Ad."] 



• A true, typical U. plicata, and not in the least like the W. 

 Indian B. firmata. 



2 New Caledonia ; ex c. P. Bouviei", Esq. 



subvar. diplostoma. 



1 Ceylon ; coll. G. Nevill, Esq. 



21. Rissoina scalariana. 



Rissoina scalariana, A. Adams, P. Zool. S. 1S61, Philippines ; fide Schwartz, 

 long. S\, diam. 3^ mil. 



1 Roweiah [Red Sea] ; coll. J. B. Baxter Esq. 



4 Mauritius, and Kharg [Persian G.J; coll. W. T. Blanford and 

 G. Nevill, Esqrs. 



Possibly better classed as a variety of B. plicata. 



22. Rissoina bertheloti. 



Rissoina bertheloti, Audouin, Descr. de VEgypte, 1826, pi. IV,fiij. 2. 



Long. 8j, diam. 3| mil. 



1 Kesm ; coll. W. T. Blanford, Esq. 

 20 Roweiah and Aden ; coll. J. B. Baxter and G. Nevill, Esqrs. 



subvar. minor. 



Long. 5, diam. 2^'^ mil. 

 3 Roweiah, Red Sea ; coll. J. B. Baxter, Esq. 



