364 RISSOIA. 



Closely related to the preceding species. R. corilea, d'Orb. of 

 Reeve's Icon, is a misprint for this species. 



R. INTERFOSSA, Nevill. PI. 66, fig. 50. 



Somewhat solid, light fulvous, with three spiral rows of granules 

 on the penultimate, five on the last whorl, and two spiral ribs at 

 the base; whorls 6, somewhat shouldered, with deep suture; lip 

 thickened. Length, 2 mill. 



Indian Ocean. 



R. ELEGANS, Angas. PI. 66, fig. 46. 



Imperforate, rather solid, whitish, closely nodose, in three (on the 

 last whorl four) spiral series ; whorls 5, angularly convex, with deep 

 suture; lip varicose. Length, 2'5 mill. 



Port Jackson, Australia. 



R. GRACILIS, Angas. PI. 66, figs. 47. 



Imperforate, moderately solid, light purplish brown; whorls 5, 

 convex, ribbed as far as the periphery of the last whorl, strongly 

 spirally lirate throughout, intersections beaded; peristome thickened. 



Length, 2'5 mill. 



Port Jackson, Australia. 

 R. STIGMATICA Frauenf. PL 66, fig. 42. 



Imperforate, thick, subpellucid, white, with 16-17, longitudinal, 

 rather close, rounded ribs, crossed by spiral line which continue 

 to the base, whilst the former there become obsolete; whorls 53, 

 flattened convex, with moderate suture ; lip varicose. 



Length, 2 mill. 



Kamorta, Nicobar Is. 



R. FENESTRATA, Krauss. PL 66, fig. 40. 



Imperforate, white, clathrate by distant longitudinal and spiral 

 narrow ribs ; whorls 7, convex, rapidly enlarging, with deep suture ; 

 lip with about 15 minute internal teeth. Length, 3 mill. 



Cape of Good Hope; on byssus of Pinna. 



R. CRYSTALLINA, Garrett. PL 63, fig. 78. 



Shell thin, subpellucid, shining, vitreous, white, with small, flex- 

 uously oblique, distant longitudinal ribs, evanescent below, and 

 close spiral lira? ; whorls 5, convex, with deep suture, lip thickened. 



Length, 2 mill. 



Viti Isles. 



