RISSOIA. '527 



R. SALEBROSA, Frauenf. PL 66, fig. 44. 



Thick, somewhat shining, brownish, depressed conical, with 10- 

 12 strong, close, rounded ribs, subnodose at the suture, and on the 

 angulated periphery of the last whorl ; whorls 5a, flattened, rapidly 

 increasing. Length, 2'6 mill. 



Sydney, Australia. 



Section APICULARIA, Monts. 1884. 



K. SIMILIS, Scacchi. PL 61, fig. 2J). 



Thin, pellucid, vitreous, whorls rounded, with 10-14 longitudinal 

 ribs, vanishing about the middle of the body whorl, with punctate, 

 impressed spiral striae; aperture small, produced in front, lip rarely 

 thickened externally ; white, peristome violaceous. 



Length, 5 mill. 



Mediterranean Sea. 



It. arata, Risso, R. ovatella, Forbes, R. rubrocincta, and R. apicu- 

 lata, Danilo and Sandri and vars. apieina, striata, decurtata, and 

 An'*X Monts., are synonyms. 



R. gemmula, Fischer, is probably a juvenile of this species. 

 R. EHRENBERGI, Phil. PL 61, fig. 27. 



Solid, upper whorls smooth, the others with from 12-14 longitu- 

 dinal plications, and spirally striated, lower part of body whorl not 

 plicate, lip acute, rarely thickened ; whitish, pearly or light yellow- 

 ish, with chestnut flames at the suture, inner lip violaceous, outer 

 lip with a spot at the base. Length, 3'7 mill. 



Mediterranean Sea. 

 It is R. elegam, Brusina. 



R. d'ORBiGNYi, Audouin. PL 67, fig. 68. 



Imperforate, rather solid, with 8-10 longitudinal rounded ribs, 

 spirally lirate ; whorls 6, convex, suture distinct; aperture a little 

 effuse below. Length, 3 mill. 



Red Sea, 

 R. INCONSPICUA, Alder. PL 62, fig. 52. 



Rather solid, but translucent, polished, whitish or light yellowish 

 white, sometimes milk-white, occasionally obscurely maculated or 

 shortly strigate with chestnut, apex corneous; numerously, nar- 

 rowly costate, the interstices closely spirally striate ; lip with white 

 varix. Length, 1'8 mill. 



Europe. 



R. maculata, Brown, R. variegata, Schwartz, and var. globosa, 

 Morch (R. Kisloensis, Dunker), are synonyms. 



