78 RISSOID. 
20. Rissoina plicata. 
Rissoina plicata, 4. Adams, P. Zool. S. 1851, I. Masbate ; Schwartz, 1. e. fig. 
21 [typical spec.], long. 56, diam. 2°65 mil.; var. = R. sealariana, A. 
Ad. and R. bertheloti, Audouin. 
50 Andamans, Arakan, Kharg, Mauritius, Bourbon, Seychelles; coll. W. 
T. Blanford and G. Nevill, Esqrs. 
10 Ceylon; coll. G. Nevill, Esq. [6,2?—apex perfect]. 
These Ceylon specimens approximate very closely to var. 
R. bertheloti. 
1 Viti-Levu ; ex Mus. Godeffroy [as “ R. firmata, C. B. Ad.” ] 
A true, typical R. plicata, and not in the least like the W. 
Indian &. firmata. 
2 New Caledonia; ex c. P. Bouvier, Esq. 
subvar. diplostoma. 
1 Ceylon; coll. G. Nevill, Esq. 
21. Rissoina scalariana. 
Rissoina scalariana, A. Adams, P. Zool. S. 1861, Philippines ; fide Schwartz, 
long. 8%, diam, 3% mil. 
1 Roweiah [Red Sea]; coll. J. B. Baxter Esq. 
4 Mauritius, and Kharg [Persian G.]; coll, W, T. Blanford and 
G. Nevill, Esqrs. 
Possibly better classed as a variety of RB. plicata. 
22. Rissoina bertheloti. 
Rissoina bertheloti, dudouin, Deser. de 0 Egypte, 1826, pl. IV, fig. 2. 
Long. 8}, diam. 3} mil. 
1 Kesm; coll. W. T. Blanford, Esq. 
2u Roweiah and Aden; coll. J. B. Baxter and G. Nevill, Esqrs. 
subvar. Minor. 
Long. 5, diam. 275 mil. 
3 Rowciah, Red Sea; coll. J. B. Baxter, Esq. 
