RISSOIA. 363 



tuberculated ; lip prominently, denticulately varicose externally. 



Length, 3 mill. 



Mediterranean Sea. 



It is R. Oceani, Arad. and Benoit, R. granulata, Requien, and 

 R. crenulata, Var. minor, Phil. 



R. SCABRA, Phil. PL 63, fig. 84. 



Longitudinally plicate, obsolete below, spirally lirate, forming 

 mamillary tubercles; whorls 6, slightly convex; white, maculated 

 with chestnut ; lip sulcate within, varicose externally. 



Length, 3 mill. 



Sicily. 



It is R. mutabilis, Schwartz. Ms. 



R. HISPIDULA, Monts. PI. 66, fig. 38. 



Rather solid, brownish, regularly clathrate by longitudinal narrow 

 riblets and more numerous spiral lirse; lip plicate within, externally 

 dentately varicose ; whorls 6, moderately convex. 



Length, 3'75 mill. 



Mediterranean Sea. 



It is R. dathrata, Phil. 



R. SUBAREOLATA, Monts. PL 65, fig. 25. 



Imperforate, translucent, brownish, subclathrate by longitudinal 

 riblets crossed by spiral line ; whorls 5, convex, with deep suture ; 

 columella arcuate, basal area cingulate, lip thickened externally. 



Length, 3 mill. 



Sicily and Algiers. 



It is R. Caribcea, Monts. R. costulata, S. Wood. R. Stefanisi, 

 Jeffreys. 



R. LEACOCKI, Watson. PL 65, figs. 33, 34. 



Minutely rimate, solid, translucent, yellowish white, with two 

 chestnut bands, white between them, with 15-18 strong oblique 

 ribs, and equally strong spiral ribs, forming rather large, close 

 nodules ; whorls 5-6, somewhat conically flattened, suture distinct ; 

 lip varicose. Length, 2'6 mill. 



Madeira. 



R. CARIBCEA, d'Orb. PL 66, fig. 57. 



Shell imperforate, thick, white, with two chestnut bands, strongly, 

 closely nodulous, with spiral ribs at the base; whorls 5, convex, with 

 rather narrow suture ; lip thick. Length, 2 mill. 



West Indies. 



