mssoiDj;. 75 



4. Rissoina indica, n. sp. 



1 Paumben Straits, South India [type]; coll, F. Armstrong, Esq. 



Another very beautiful, shining, " Mangelia-like " form, 

 dredged alive in 35 fathoms ; it is not unlike R. terebra, Garrett, 

 PL 2, fig. 11, of the Proc. Acad. Philad., and also resembles B. 

 incerta, Souverbie ! It has eight perfectly "planulate " whorls, 

 the apical one smooth, the others with perfectly perpendicular, 

 regular, very massive ribs, otherwise smooth ; columella and 

 interior of aperture stained brown, scarcely notched at base, 

 outer margin white and remarkably thickened. 



Long. 5, diam. \^ mil. 



5. Sissoina subdebilis. 



Rissoina subdebilis, Nevill ms., WeinJcauff, Conch.'Cab. II,lSSl,]pl. 15 B, 

 fig 9, Mauritius. 



20 Mauritius (type) ; coll. G. Nevill, Esq. 



May possibly prove to be a large, cylindrical, subangulate 

 variety of B. debilis, Garrett, P. Acad. Philad. 1873, pi. 2, fig. 9. 



Long. 6, diam. 2^ mil. 



van perlanceolata [? dist. sp.] 



1 Mauritius (type var.) ; coll. G. Nevill, Esq. 

 A well-marked form with ten whorls. 



6. Rissoina, n. sp. 



5 Kesm (Persian G) ; coll. W. T. Blanford, Esq. 



Somewhat resembles the fossil B. grateloupi, Orbigny. 

 Long. 3f, diam. 1| mil. 



? var. [? dist. sp.] 



1 Seychelles ; coll. G. Nevill, Esq. 

 Long. 4, diam. If mil. 



? var. [? dist. sp.] 



2 New Caledonia; ex c. P. Bouvier, Esq. 



