376 RISSOINA. 



K. OBELISCUS, Eecluz. PL 54, fig. 9. 



Solid, white, a little shining, semipellucid, with 12-13 strong, 

 elevated costee, cutting the basal rib into tubercles, thinly, closely 

 spirally striate ; whorls 8-9, turreted, with deep, undulating suture ; 

 lip strongly, nodosely varicose. Length, 4*5 mill. 



Mauritius, Upolu. 



It is R. Schwartziana, Dunker (from the latter locality.) 

 R. COSTATA, A. Ad. PL 56, fig. 57. 



Opaque, solid, white, with strong, elevated, longitudinal ribs, sub- 

 angulated above, closely spirally striate ; whorls 7, flatly convex, 

 suture undulated ; columella subtuberculate below, lip subdilated, 

 flexuous, strongly varicose. Length, 4*7 mill. 



Cobija, Peru ; Philippines, f 

 R. BAXTERIANA, Nevill. PL 56, fig. 75. 



Solid, shining, white, with close, large, rounded longitudinal ribs, 

 constricted into three spiral series of nodules, base spirally sulcate ; 

 lip thick, but scarcely varicose. Length, 3 mill. 



Red Sea. 



Weinkauff suggests that this is the juvenile of E. nodicineta, A. 

 Ad., but I scarcely think so. 

 R. SUBDEBILIS, Nevill. PL 55, fig. 36; PL 56, fig. 55. 



Shell solid, whitish, with about 14 compressed, suboblique ribs 

 and slight spiral striae, the ribs abruptly terminated by two or three 

 basal spiral riblets; whorls about 12, slightly convex, suture sub- 

 channeled. Length, 6'5 mill. 



Mauritius. 



It is R. canaliculata, Sowb. (fig. 55). Nevill, who has indicated 

 a var. perlanceolata, thinks this may = R. debilis, Garrett. 

 R. WEINKAUFFIANA, Nevill. PL 56, fig. 61. 



Rather solid, brownish white, with narrow, rather close, sub- 

 flexuous ribs, and numerous, less distinct spiral striae, base very in- 

 distinctly doubly ridged ; lip smoothly varicose. Length, 6*75 mill. 



Andaman Is. 



It is not unlikely that this will prove identical with the preceding 

 species. In the original figure the ribs are shaded and the inter- 

 stices left light, an error which has been carefully copied in my illus- 

 tration. 

 R. MINUTA, Nevill. PL 56, fig. 65. 



Shining, white, with longitudinal, thick, slightly oblique, some- 

 what irregular ribs, and smooth interstices; whorls 8, angularly 



