380 RISSOINA. 



R. CHESNELII, Mich. PL 56, figs. 73, 74. 



White, shining, semipellucid, with about 14, subsinuous longi- 

 tudinal costse, and about equal interstices which are scarcely spi- 

 rally striate ; whorls 8, a little convex, suture well-impressed, a 

 little undulated ; lip with a strong, wide varix. Length, 3'6 mill. 



Florida, West Indies. 



The synonyms are R. Catesbyana, d'Orb. (fig. 74), R. scalar ella, 

 C. B. Ad., R. Candida, Brown, and var. Floridana, Morch. 

 R. TRITICEA, Pease. PL 56, fig. 76 ; PL 57, fig. 77. 



Whitish, with 11 compressed, prominent, continuous longitudinal 

 ribs, spiral sculpture very indistinct or wanting ; whorls 6, slightly 

 convex, with impressed suture ; lip thickened. Length, 2*75 mill. 

 Red Sea, Indian Ocean, Mauritius, Polynesia. 



It is R. scalariformis of Schwartz, etc. (not Ads.) in part, R. 

 orientalis, Nevill, and R. exigua, Dunker (fig. 77). 

 R. BUREASENSIS, Sowb. PL 68, fig. 10. 



Solid, yellowish white, with slight, curved longitudinal ribs, 

 fading out on the upper part of the body whorl, smooth ; columella 

 thick, short, rather tortuous, almost truncated, outer lip thick. 



Length, 5'5 mill. 



Ins. Bureas, Philippines. 

 R. CINCTA, Angas. PL 68, fig. 8. 



White, interruptedly chestnut banded, flexuously longitudinally 

 costate, the interstices spirally striate ; whorls 7, slightly convex, 

 the last subreticulated. Length, 5 mill. 



Port Jackson, Australia. 

 R. FASCIATA, Angas. PI. 68, fig. 7. 



Fulvous, with a peripheral chestnut band, appearing on the spire 

 whorls at the suture, with numerous, flexuous longitudinal ribs ; 

 whorls 7, slopingly convex; outer lip thick, columella short, almost 

 truncate. Length, 6 mill. 



New Zealand. 

 R. ROSEA, Desh. PL 68, fig. 4. 



Rosy white, or roseate, longitudinally plicate, plicae occasionally 

 varicose ; whorls 8, slightly convex, with submargined suture ; 

 columella subplicate, lip white, widely thickened. Length, 6 mill. 



Ins. Bourbon. 

 R. FLEXUOSA, Gould. PL 68, figs. 2, 1. 



Yellowish or chestnut brown, with about 15 obtuse, flexuous lon- 

 gitudinal ribs, and numerous spiral lines; whorls 7, angularly 



