80 



1 Mauritius ; coll. G. Nevill, Esq . 

 12 Kesin [Persian G.] ; coll. W. T. Blanford, Esq. 



Long. 6J, diam. 2 f . 



var. ? [dist. sp. ?] 

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



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

 all in most wretched condition. 



They may be a var. of P. bertholeti, but 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., 1860, Sandwich I. 



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



2 Mauritius; coll. G. Nevill, Esq. 



1 Roweiah, Red Sea; coll. J. B. Baxter, Esq. 



var. cernica, Nevill. 

 Long. 2J, diam. 1 mil. 

 10 Mauritius; coll. G. Nevill, Esq. 



var. ceylonica, Nevill. 

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



Long. 3, diam. 1 mil. 



Whorls 6J, 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, strisB 

 above it ; basal emargination of aperture well marked; peristome 

 callously thickened ; throughout, almost microscopically, trans- 

 versely striate. 



