RISSOIA. 331 



columella unidentatc ; whitish, irregularly flexuously strigate with 



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



violaceous. Length, 5*8 mill. 



Mediterranean Sea. 



It is R. suhearinata, ('antr., R. dentata, Dan. et Sandri. 

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



Thick, with 14-1() strong, rounded ribs, those of the body whorl 

 terminating at the subangulated ])criphery, 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. ORossA, Mich. PI. m, fig. 36. 



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

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

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



Mediterranean Sea. 

 R. ORLONGA, Desm. PI. 62, fig. 45. 



Shining, hyaline, with twelve wide longitudinal i^lications, short 

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

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

 on the lip. Length, 5 mill. 



Mediterranean Sea. 



It is R. eloiigata, Brusina. 



R. ELATA, Phil. PI. 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. 



JefFi'eys makes this species a variety of R. memhranacea. 



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



Section Zippora, Leach. 1847. 



*R. AURiscALPiUM, Linn. PI. 62, figs. 42, 43. 



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

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



