384 RISSOINA. 



R. Oiirtisii, E. A. Smith (fig. 11), and R. australis, Sowb. (PI. 68^ 

 fig. 11), are synonyms. 

 R. CERiTHiiFORMis, Dunker. PI. 57, fig. 92. 



Solid, semipellucid, shining, white, with sometimes a single yel- 

 lowish band, with 16-18 riblets, vanishing on the base, crossed by 

 spiral lirse, of which there are 4 on the spire, and 7 on the body 

 whorl ; whorls 7-8, flatly convex, with channeled suture, base with 

 funiculum ; lip externally varicose, columella subtruncate below. 



Length, 3'3 mill. 



Red Sea, Mauritius, Viti and Sandtvich Is. 



R. Erythrcea, Schwartz, not Phil., is identical, and is the only 

 figure heretofore published ; it shows a basal tooth, which is not 

 mentioned in the description, nor does it exist in any of my speci- 

 mens. It is probably an accidental efiect of the produced canal in 

 an old specimen. 

 R. EXASPERATA, Souvcrb. PI. 57, fig. 96. 



White, with numerous subobtuse longitudinal ribs and elevated 

 spiral lines, forming rough intersections; whorls 8-9, convex, with 

 deep suture, base subcompressed ; lip crenulately varicose. 



Length, 3-5-4-5 mill. 



New Caledonia, Viti Is. 

 R. Sagraiana, d'Orb. PI. 57, fig. 86. 



Solid, shining, semipellucid, white, granulated by decussating 

 longitudinal and spiral ribs, base with a granular funiculum ; 

 whorls 8-9, convex, with deep suture ; lip varicose. 



Length, 4*3 mill. 



West Indies. 

 R. Samoensis, Dunker. PI. 57, fig. 99. 



Solid, Avhite, with about 14 longitudinal ribs, crossed by spiral 

 lines, of which there are 7 in the last whorl, basal funiculum nodu- 

 lous ; lip crenulately varicose. Length, 4 mill. 



Ins. TJpolu, Taheiti. 



R. CREBRISULCATA, Sowb. PI. 68, fig. 13. 



Whitish, scabrous, Avith strong, longitudinal, suboblique ribs, 

 nodosely decussated by thin spiral lirte ; whorls 8, slightly convex ; 

 aperture channeled below, with a short, thick columella, outer lip 

 thick, crenulately varicose. Length, 4 mill. 



Hah. unlcnown. 

 R. SCABRA, Garrett. PI. 58, fig. 6. 



Shell solid, vitreous, shining, white, with small, rather close, 

 compressed, slightly oblique longitudinal ribs, crossed by numerous 



