88 RISSOIDA. 
61. Rissoina mohrensterni. 
Rissoina mohrensterni, Deshayes, Moll. Reunion, 186n; ae 4, diam. 2 mil. ; 
=R. schmeltziana, Dkr. from Upolu. 
20 Mauritius, Aden, Andamans, and Seychelles; coll. G. Nevill, Esq. 
2 Upolu; ex Mus, Godeffroy [as R. schmeltziana, Dis] 
Very variable i in size, long. bg 3, diam, 23 mil. —another 45, 2— 
a third 34, 14, all from Mauritius! Can this be the R. tenuistriata 
of Pease from Paumotu ;—long. 9, diam. 4 mil? I should sup- | 
pose this can scarcely be the case. 
62. Rissoina andamanica. 
Rissoina andamaniea, V einkauff, Conch.-Cab. II, 1881, pl. 15B, fig. 6: 
Andamans—tong. 8, diam. 33 mil. 
Jo Andamans [type]; coll. J. Wood-Mason and G. Nevill, Esqrs. 
Long. 7, diam. 3 mil—another 53, 24 mil. 
63. Rissoina concinna. 
Rissoina concinna, A, Adams, P, Zool. 8, 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.—Mercutetta, Nevill. 
Type R. gigantea, Desh. ;= Group V, Schwartz, 1. e. 
This is the Group V of Schwartz, 1. c., page 39. 
64. Rissoina gigantea, 
Rissoa gigantea, Deshayes, Traité élem. Conch., 1848, fig. 18, 20 [sine 
descr, ] ;= B. cumingi, H. and A. Adams, Gen. I, 1854, Ticao, 
1 Andamans ; coll. Major Rogers [243, 10}, slightly decollate]. 
