SBO RI8S0IA. 



R. Desmaresti, Audouin. PI. 67, fig. 67. 



Thin, elevated conical, with 10-12 low longitudinal costse, fading 

 out towards the base ; whoids 6, slopingly flattened, suture distinct ; 

 peristome simple. Length, 3 mill. 



Bed Sea. 

 R. Waabitica, Issel. PI. 68, fig. 98. 



Rimate, somewhat solid, a little shining, opaque, white, longitu- 

 dinally thinly costate, sculpture fading above the middle of the> 

 body whorl ; interstices spirally striate ; whorls 4?, slightly convex,; 

 with distinct suture ; lip simple. Length, 1'3 mill. 



Red Sea. 

 R. PsAMMiTicA, Issel. PI. 68, fig. 99. 



Rimate, fragile, subopaque, slightly shining, white, densely de- 

 cussated by longitudinal ribs, fading out anteriorly, and close spiral 

 striae; whorls 42, suture a little impressed ; peristome thin. 



Length, 1 mill. 



Red Sea. 



Section Persephona (Leach. 1852), Monts. 1884. 



R. violacea, Desm. Pl. 62, figs. 37-39. 



Solid, with subangulate periphery; longitudinal ribs 10, short on 

 the last whorl, which is ornamented with spiral series of puncta- 

 tions ; lip externally thickened ; whitish, purplish on the spire, the 

 periphery purple-zoned, j^eristome violaceous, the varix white. 



Length, 5*3 mill. 



Europe^ 



It is R. punctata, Potiez, R. purpurea, Mc Andrew, R. amethystma, 

 Renier. 

 Var. RUFiLABRUM, Alder. Fig. 38. 



Corneous, yellowish or greenish yellow, not banded, lip chestnut 

 <3olor. 



It is R. hyalina, Desm. 



Var. PORiFERA, Loven. Fig. 39. 



Corneous or yellowish, peripliery rounded ; without ribs, deeply 

 spirally pitted ; peristome chestnut color, 



Var. ecostata, Jeffreys, is a synonym. 



Section Schwartzia, Bucq., Dautz., Dollf 1884. 



R. MONODONTA, Bivona. PI. 62, fig. 41. 



Thick, hyaline, very smooth, shining, last whorl sometimes a 

 little angulated ; aperture expanded below, lip varicose exteriorly, 



