RISSOIA. 343 



the last with sharp peripheral aDgle ; columella a little twisted, lip 

 acute. Length, 2'8 mill. 



Panama. 

 R. ANGULIFERENS, Folin. PI. 70, fig. 62. 



Shining, very minutely longitudinally and spirally striate, whitish, 

 with a broad fulvous band on the top of the whorls, and another on 

 the middle of the base ; whorls 6, flattened with slight angle above 

 and below the deep suture, and sharply angulated periphery ; peris- 

 tome acute. Length, 2'5 mill. 



Panama. 



R. TENUISCUI.PTA, Watson. PI. 69, fig. 55. 



Scarcely rimate, thin, vitreous, pellucid, yellowish white, with 

 incremental striae, and distant, irregular, very slight spiral lines ; lip 

 thin, a little produced below. Length, 2 mill. 



Madeira, Algiers, etc. 

 R. SCOPULORUM, Watson. PL 70, fig. 60. 



Thin, smooth, glossy, rufous brown ; whorls 9, flattened, with ob- 

 scurely angulated periphery and short base, suture slight, defined 

 by the peripheral projection of the whorl above ; lip thin, slightly 

 patulous on the base. Length, 1*75 mill. 



Reefa off Honolulu, Sandwich Is. 



R. RUSTICA, Watson. PI. 70, fig. 61. 



Rather thick, white, with or without slight traces of longitudinal 

 ribs, and traces of microscopic spiral lines, smooth, polished, apex 

 large, rounded ; whorls 6, periphery very obsoletely angular, suture 

 linear, not impressed; lip sharp, patulous, but a little inverted 

 above ; umbilicus rimate. Length, 3 mill. 



Off Pernambueo, Brazil; 350 fms. 



R. ALVEARIUM, Watson. PL 70, fig. 59. 



Slightly umbilicated, with blunt apex, barely convex whorls, 

 suture linear ; glossy white ; lip simple. Length, 1*25 mill. 



Off Culebra Isl, W. Indies; 390 fms. 



R. MERCUEIALIS, Watson. PL 64, fig. 92. 



Imperforate, white, translucent, shining, apex obtuse; whorls 7, 

 slightly convex, with faint growth-lines and close-set spiral striae, 

 suture narrowly margined, not deep ; lip a little expanded. 



Length, 3'75 mill. 



Wednesday Isl.; N. E. Australia. 



Possibly a Ceratia. 



