88 RISSOID^, 



61. Rissoina mohrensterni. 



Eissoina mohrensterni, Beshayes, Moll. Reimion, 1S63, long. 4, diam, 2 mil.; 

 =^R. schmeltziana, Dlcr.Jrum Uiiolu, 



20 Mauritius, Aden, Andnmans, and Seychelles; coll. G. Nevill, Esq. 

 2 Upolu; ex Jlus. Godeffroy [as 11. scliuieltziaua, Dkr.] 



Very variable in size, lono'. 5|, diam. 2| mil. — another 4|, 2 — 

 a third 3 j, 1^, all from Mauritius ! Can this be the JK. tenuldriata 

 of Pease from Paumotu ;— -long. 9, diam. 4 mil ? I should sup- 

 pose this can scarcely be the case. 



62. Rissoina andamanica. 



Rissoina andamanica, Jl- euilavff. Conch. -Cab. II, 1881, pi. 15 B, fig. 6> 

 Andamans — long. 8, diam. 3^ mil. 



10 Andamans [type] ; coll. J. Wood-Mason and G. Nevill, Esqrs. 



Long. 7, diam. 3 mil. — another 5f , 2| mil. 



63. Rissoina concinna. 



Rissoina concinna, A. Adams, P. Zool. S, 1851, Philippines, long. 5-3, diam. 

 2 mil. 



Prof, von Martens has recorded the species from Mauritius. 

 I have not been able to identify it with any of the Museum 

 specimens. 



Section F. — Mcerchiella, Nevill. 



Type R. gigautea, Beah. -, = Group V, Schwartz, I. c. 



This is the Group V of Schwartz, 1, c, page 39. 



64. Rissoina gigantea. 



Rissoa gigantea, BesJiages, Traite clem. Conch., 1848, fig. 18, 20 [«Me 

 descr,'] ; = -S. cwningi, H. and A. Adams, Gen. I, 1854, Ticao, 



1 Andamans ; coll. Major Rogers [24i, lOJ, slightly decollate]. 



