RISSOINA. 371 



R. MONILIS, A. Ad. PI. 55, fig. 28. 



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 stride; 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. PI. 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. FORTIS, 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. 



Panama to Cape /St. Lucas. 

 R. STRICT A, Menke. PL 55, fig. 26. 



White, densely, smoothly longitudinally costate, 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. perpusilla, N.evill. 



