374 RISSOINA. 



striae more distinct on the base; whorls 6, besides the embryonic, 

 flatly convex; lip thick, externally varicose. Length, 3'5 mill. 



Sandivich Islands. 



R. SUBVILLICA, Weinkauff. PL 56, fig. 54; PI. 68, fig. 100. 



Whitish, with strong, rounded longitudinal ribs, replaced by 

 spiral riblets below the middle of the body whorl; whorls 11, swollen, 

 turreted. Length, 15 mill. 



Loochoo Is- 



Figured in Conch. Icon, as R. villica, Gould, (fig. 100). 



R. COSTULATA, Dunker. PL 57, fig. 90. 



Shell strong, whitish, rather yellowish below, with about 14 longi- 

 tudinal suboblique ribs; whorls 8, slightly convex; aperture chan- 

 neled below, lip thickened. Length, 5 mill. 



Japan. 



Unfigured and doubtful Species. 



R. WOOD-MASONIANA, Nevill. Andaman Is. 



R. INDICA, Nevill. Paumben Sts., So. India. 



R. EFFUSA, Morch. West Coast of Centr. America. 



R. FIRMATA, C. B. Ad. Panama. 



The shell figured by Schwartz for this species and copied by 

 Kiister is a very doubtful identification, as is that of R. scalar if ormis, 

 C. B. Ad. which Carpenter declares to be a young shell of R. firmata, 

 from an examination of Adams' type specimens. Sowerby, in Reeve's 

 "Iconica," places R. firmata in the synonymy of R. Woodwardi, 

 Carp. 



Section RISSOLINA, Gould. 1861. 



R. ELEGANTISSIMA, d'Orb. PL 56, fig. 51. 



Thick, yellowish white, with close, rounded, longitudinal ribs, cut 

 into a row of nodules next the suture, spirally very thinly striate ; 

 whorls 8, rather flat, suture excavated ; lip thick, varicose. 



Length, 3'5 mill. 



West Indies. 



R. multicostata, C. B. Ad. is possibly identical. 



R. DUBIOSA, C. B. Ad. PL 56, fig. 52. 



Solid, subpellucid, whitish or yellowish, with about 18-20, straight, 

 elevated longitudinal ribs, scarcely spirally striate; whorls 7-8, 



