RISSOID^J. 75 



4. Bissoina 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, 

 PI. 2, fig. 11, of the Proc. Acad. Philad., and also resembles R. 

 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. 1|- mil. 



5. Bissoina subdebilis. 



Sissoina subdebilis, Nevill ms., WeinJcauff, Conch.- Cab. 11,1881, pi. 15 B, 

 Jig 9, Mauritius. 



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



May possibly prove to be a large, cylindrical, subangulate 

 variety of R. deUlis, Garrett, P. Acad. Philad. 18 73, pi. 2, fig. 9. 

 Long. 6, diam. 2| mil. 



var. perlanceolata [? dist. sp.] 



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

 A well-marked form with ten whorls. 



6. Bissoina, n. sp. 



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



Somewhat resembles the fossil R. grateloupi, Orbigny. 

 Long. 3f , diam. 1J mil. 



? var. [? dist. sp.] 



1 Seychelles; coll. G. Nevill, Esq. 

 Long. 4, diam. If mil. 



? var. [? dist. sp.] 



2 New Caledonia; exc. P. Bouvier, Esq. 



