RISSOIA. 



R. NOVARENSIS, Frauenf. PL 66, fig. 45. 



Imperforate, thick, whitish, with two fulvous bands, with 12-13 

 narrow ribs, the interstices spirally striate ; whorls 6, convex, sub- 

 gradate ; lip produced, varicose. Length, 3 mill. 



Hob. unknown. 

 R. LILACIKA, Recluz. PL 62, fig. 40. 



Obtuse, solid, porcellanous, shining, violaceous, with curved dis- 

 tant ribs, and spiral, densely punctate, impressed striae, apex dark 

 violet ; peristome thick, white, violet-margined, bidentate within, 

 varix white, with an orange streak behind it. Length, 5 mill. 



Atlantic Coast of France. 



Turbo violaceus, Muhlf., is a synonym. 



Section RISSOSTOMIA, Sars. 1878. 



R. MEMBRANACEA, Adams. PL 61, figs. 19-26. 



Rather thin, membranaceous, subhyaline, smooth or longitudi- 

 nally costate, the last whorl inflated, smooth or with short costa3, lip 

 expanded and thickened ; corneous or brownish, with undulating, 

 longitudinal chestnut lines, sometimes absent ; outer lip usually 

 with three chestnut spots. Length, 7-9 mill. 



Europe. 



Varies greatly in texture and sculpture. 



The synonyms are R. labiosa, Montg., R. fragilis, Mich., R. Sou- 

 leyetiana, Recluz, R. pulla, Brown, R. cornea, Loven (Figs. 25, 26). 



Var. OCTONA, Nilsson. Figs. 23, 24, 



Shell narrower, more cylindrical. 



Var. angustissima, WeinkauiF, is a synonym. 

 R. LINEOLATA, Michaud. PL 61, fig. 28. 



Thin, hyaline, vitreous, with 14-16 slightly oblique longitudinal 

 ribs, last whorl ventricose, the lower part smooth ; aperture sub- 

 dilated below ; color light yellowish or corneous, with narrow, lon- 

 gitudinal fulvous strigations, which become flexuous below, lip with 

 a single spot below. 



France. 

 R. LIA, Benoit. PL 62, fig. 33. 



Rather solid, opaque, fulvous brown with white apex, with 

 rounded longitudinal ribs and thin spiral striae, the sculpture often 

 obsolete on the last whorl ; lip simple, columella tinted with viola- 

 ceous. Length, 4 mill. 



Mediterranean Sea. 



