88 BISSOUXZE. 



61. Bissoina mohrensterni. 



Bissoina mohrensterni, Deshayes, Moll. Reunion, 1863, long. 4, diam. 2 mil. ; 

 =B. schmeltziana, Dkr.from 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. 5f, diam. 2| mil. another 4|, 2 

 a third 3J, 1 J, 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. Bissoina andamanica. 



Rissoina andamanica, Weinlcauff, 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 , 2J mil. 



63. Bissoina 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 S. gigantea, Desh. ; = Group V, Schwartz, I. c. 

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



64. Bissoina gigantea. 



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

 desa\~] ; = S. cumingi, H. and A. Adams, Gen. 1, 1854, Ticao. 



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



