342 RISSOIA. 



R. VITREA, Garrett. PI. 68, fig. 18. 



Minute, thin, pellucid, smooth, microscopically spirally striate, 

 shining, Avhite ; whorls 5, flattened convex, apex obtuse, suture well 

 impressed, slightly margined ; peristome rather thick, simple. 

 Length, 7*5 mill. 



Viti Is. 

 Section HEMISTOMIA, Crosse. 1872. 



R. CALEDONICA, Crosse. PI. 68, fig. 20. 



Subimperforate, subtranslucent, thin, light olivaceous corneous, 

 under a darker epidermis; whorls 5J, somewhat convex, moderately 

 increasing, with impressed suture ; lip simple, continuous, subsolute. 



Length, 2*5 mill. 



New Caledonia, brackish water. 



Subgenus CINGULA, Fleming. 1828. 

 Section CINGULA (sensu stricto). 



R. CINGILLUS, Mtg. PI. 69, fig. 25. 



Rather solid, scarcely pellucid, yellowish brown, with two or 

 three chestnut bands; whorls 6, flattened, spirally striate; lip 

 acute, not thickened. Length, 4'3 mill. 



Atlantic Coasts of Europe. 



It is R. vittatus, Donovan, R. trifasdata, Adams, Turbo graphicus, 

 Brown. 

 Var. RUPESTRIS, Forbes. Not banded. 



R. BALTEATA, Manzoni. PI. 69, fig. 57. 



Thin, hyaline, smooth, suture widely margined, apex obtuse ; 

 whorls 3-1, flattened; lip simple, solid ; narrowly rimate. 



Length, 1'5 mill. 



Canary Is. 



This should possibly be referred to Ceratia. 



R. MILLERI, Folin. PI. 71, fig. 94. 



Rather smooth, Avith obscure decussating very minute lines, yel- 

 lowish or orange color, shining ; whorls 6, slopingly flattened, the 

 last with scarcely angulated periphery, suture deep ; lip thickened 

 below, base with a few spiral striae. Length, 3'7 mill. 



Cape Verd Is. 

 R. CONICA, Perier. PI. 71, fig. 95. 



Shell yellowish, banded with light chestnut, two bands above the 

 periphery of the last-whorl and one below it; whorls 5, flattened, 



