RISSOIA. 331 



columella unidentate ; whitish, irregularly flexuously.strigate with 

 chestnut, darker behind the varix, columella, periphery and apex 



violaceous. Length, 5'8 mill. 



Mediterranean Sea. 



It is R. subcarinata, Cantr., R. dentata, Dan. et Sandri. 

 R. VENUSTA, Phil. PI. 62, fig. 32. 



Thick, with 1416 strong, rounded ribs, those of the body whorl 

 terminating at the subangulated periphery, suture undulated ; per- 

 istome subexpanded, varicose, columella bluntly unidentate; yel- 

 lowish brown, with numerous chestnut longitudinal, sometimes 

 flexuous lines, ribs white. Length, 7 mill. 



Mediterranean Sea. 



R. oblonga, Midd., is a synonym. 



R, GROSSA, Mich. PL 66, fig. 36. 



Thick, strongly, ^irregularly plicate; columella subplicate ; yel- 

 lowish white, with chestnut strigations between the ribs on the last 

 whorl, and two maculations on the varicose lip. Length, 8 mill. 



Mediterranean Sea. 

 R. OBLOXCJA, Dosm. PI. 62, fig. 4-K 



Shining, hyaline, with twelve wide longitudinal plications, short 

 on the last whorl, suture subundulated; lip varicose, columella sub- 

 plicate ; white, fulvous between the ribs, three fulvous maculations 

 on the lip. Length, 5 mill. 



Mediterranean Sea. 



It is R. elo>if/at<i, Brusina. 



R. ELATA, Phil. PL 62, fig. 44. 



Shell with acute spire, shining, upper whorls smooth, afterwards 

 with strong, irregular rounded costae, evanescent on the base ; lip 

 much thickened, expanded, varicose ; white, with fulvous short 

 flames between the ribs, and three fulvous spots on the lip. 



Length, 8 mill. 



Mediterranean Sea. 



R. cylindracea, Kryn., is probably a synonym. 



Jeffreys makes this species a variety of R. membranacea. 



R. PARADOXA, Monts. (unfigured.) Mediterranean. 



Section ZIPPORA, Leach. 1847. 



R. AURISCALPIUM, Linn. PL 62, figs. 42, 43. 



Narrow, subulate, with acute apex, hyaline, translucent, smooth 

 or obsoletely widely costate, vanishing on the last whorl, base with 



