88 RISSOID^. 



61. Rissoina mohrensterni. 



Elssoina mohrensterni, Deshayes, Moll. Beunionf 1863, long. 4, diam, 2 mil.; 

 z=R. schmeltziana, DJcr.Jrom Upolu. 



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

 2 Upolu; ex Mus. Godeffroy [as R. schmeltziana, Dkr.] 



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

 a third 3}, 1 J, all from Mauritius ! Can this be the B. teviuUtriata 

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

 pose this can scarcely be the case. 



62. Rissoina andamanica. 



Rissoina andamanica, Ti' einTcauff, 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 5|, 2| mil. 



63. Rissoina concinna. 



Rissoina concinna, A. Adams, P. Zool. B, 1851, Fhilippines, 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, Desk. ; = Group V, Schwartz, I. c. 



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



64. Rissoina gig ante a. 



Rissoa gigantea, Deahayes, Traite elem. Conch., 1848, fig. 18, 20 [sine 

 descrj] ; = S. cumingi, H. and A. Adams, Gen. I, 1854, Ticao, 



1 Andamans ; coll. Major Rogers [24^, 10^, slightly decollate]. 



