RISSOINA. 371 



R. MONILIS, A. Ad. PL 55, fig. 23. 



Solid, light fulvous, with a sutural row of nodules, and close, 

 narrow, longitudinal plications, the interstices spirally punctate- 

 striate; whorls 7, flattened; varix striate. Length, 4'9 mill. 



Philippines. 

 R. KREBSI, Morch. PL 54, fig. 7. 



Semipellucid, white, with about 28 thin, subsinuous, longitudinal 

 riblets, cut into a row of tubercles just below the suture, decussated 

 by spiral, close striae; whorls 7, convex, with slightly impressed 

 suture; lip varicose. Length, 3*5 mill. 



Cuba, Jamaica. 



Schwartz has described and figured this as R. multicostata, Ads. 



R. MICANS, A. Ad. PL 55, fig. 28. 



Rather solid, white, shining, subdistantly, elevately plicate, inter- 

 stices spirally striate, last whorl sulcate below; whorls 9, convex; 

 lip varicose. Length, 4'7 mill. 



Philippines. 

 R. FORTH, C. B. Ad. PL 55, fig. 25. 



White, with 22 rather strong, rounded, nearly straight, longitu- 

 dinal ribs; whorls 10, somewhat turreted, flattened, with crenulated, 

 rather deep suture ; lip strongly varicose. Length, 7'4 mill. 



I ^ mama to Cape St. Lucas. 

 R. sTRH'TA, Menke. PL 55, fig. 26. 



White, densely, smoothly longitudinally cost-ate, the interstices 

 obsoletely spirally striate; whorls 7, flattened. Length, 7 mill. 



Mazatlan. 



Very closely allied to the preceding species, if not identical with 

 it. 



R. AMBIGUA, Gould. PL 55, figs. 31, 27, 29, 35; PL 54, fig. 7. 



Whitish, with about 20 narrow, small, longitudinal plications, 

 often becoming faint on the last whorl, closely spirally striate; 

 whorls about 10, flatly convex, with impressed suture; lip varicose. 



Length, 7'3 mill. 



Aden, Ceylon, Singapore, Paumotus, Sandwich IsL, Mauritius, 

 Viii Is., etc. 



It is R. pusilla, Schwartz, not Brocchi (fig. 27), R. cincta, Dunker, 

 R. myosoroides, Recluz (fig. 29), R. striolata, Dunker, R. multicos- 

 tata, Garrett (fig. 9) R. costulifera, Pease, R. subconcinna, Sou verb. 

 (fig. 35) and var. pcrpuxilla, Nevill. 



