80 RISSOIDyR. 



1 Mauritius ; coll. Cx. Nevill, Esq. 

 12 Kcsui [Persian G.] ; coll. \V. T. Blanford, Esq. 



Long. 6|, diam. 2 f . 



var. ? [dist. sp. ?] 



12 Bombay, Tuinb I. and Gwadar ; coll. W. T. Blanford, Esq. [6h, 2f]. 



I can see no trace of spiral striatiou, but the specimens are 

 all in most wretclied condition. 



Tliey may be a var. of i?. hertholeti, bnt the ribs are irregular- 

 ly flexous instead of regularly perpendicular, and a little more 

 numerous ; it is also a more attenuate shell. 



26. Bissoina turricula. 



Rissoina turricula, Pease, P. Zool. S., 1S60, Sandwich I. 



1 Sandwich Isl. [typical] ; coll. W. Pease, Esq. [3i, 1^]. 



2 Mauritius; coll. G. Mevill, Hlsq. 



1 lloweiab, Ked Sea; coll. J. B, Baxter, Esq. 



var. cernica, Nevill. 



I 



Long. 2|, diam. 1 mil. 

 10 Mauritius j coll. G. Nevill, Esq. 



var. ceylonica, Nevill. 

 2 Galle [type var.] ; coll. J. B. Baxter, Esq. 



Long. 3, diam. 1 mil. 



"Whorls 6|, two apical ones smooth, the others somewhat 

 convexly turriculate,with flexuous, rather distant, well-developed, 

 longitudinal ribs, the last of all with a basal, subgranulose, 

 transverse keel, with two transverse, fine, but distinct, striae 

 above it ; basal ema.rgination of aperture well marked; peristome 

 callously thickened ; throughout, almost microscopically, trans- 

 versely striate. 



