334 RISSOIA. 



R. INCONSPICUA, Alder. PL 63, figs. 57, 58. 



Rather solid, but translucent, shining ; whitish or light yellowish 

 white, occasionally milk-white, maculated or strigated with chest- 

 nut between the ribs, apex corneous ; suture distinct but not deep ; 

 closely, thinly, longitudinally costate, less numerous and stronger in 

 the last whorl, with close spiral striae ; lip white-varicose. 



Length, 1'8 mill. 



Europe. 



It is R. macalata, Brown. 



Var. VARIEGATA, Schwartz. Fig. 58. 



Shell smooth, yellowish brown, longitudinally flamed with chest- 

 nut. 



H. ALBELLA, Loven. PI. 63, figs. 59-62. 



Hyaline, subinflated, with convex whorls, spire costate, body 

 whorl smooth, or distantly longitudinally costate above, or spirally 

 striate; inner lip free, forming an umbilical fissure; whitish, mimed 

 with chestnut at the suture and base, apex violaceous. 



Length, 3-3'6 mill. 



Xorihern, Europe, Mediterranean 8ea? 



A very variable species ; it is R. Benzi, Aradas & Benoit, R. 

 Oenonensis, Brusina, R. supracostata, Sowb., R. Taraioui, Appelius. 



Var. SARSI, Loven. Figs. 60-62. 



Thinner, lip acute, entirely smooth, with a series of sutural ino- 

 culations. 



R. MARGINATA, Mich. PI. 63, fig. 68. 



Solid, shining, narrowly, rather distantly costulate, suture sub- 

 undulated, white-margined; yellowish brown, ribs, base of bodv 

 whorl and vnrix white, bimaculate with chestnut behind the varix. 



Length, 5 mill. 



Mediterran ean /Sea. 

 R. AN<;I;LATA, Jeffreys. PL 65, fig. 16. 



Imperforate, solid, opaque, a little shining ; whorls 4, com- 

 pressed, with 10-12 slightly curved strong ribs, and no spiral 

 strire, periphery distinctly angulated ; lip acute. Length, 2 mill. 



Adventure Bank, Mediterranean. 



R. XANTHIAS, Watson. PL 67, fig. 71. 



Scarcely rimate, thin, glossy, translucent white, with from 12-16 

 narrow, continuous ribs, vanishing towards the base where there 



