334 RISSOIA. 



R. INCONSPICUA, Alder. PI. 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. maculata, Brown. 



Var. VARIEGATA, Schwartz. Fig. 58. 



Shell smooth, yellowish brown, longitudinally flamed with chest- 

 nut. 



R. 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, flamed 

 with chestnut at the suture and base, apex violaceous. 



Length, 3-3'6 mill. 



Northern Europe, Mediterranean Sea f 



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

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



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



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

 culations. 



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



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

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

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



length, 5 mill. 



Mediterranean Sea. 

 R. ANGULATA, Jeffreys. PL 65, fig. 1 6. 



I mperforate, solid, opaque, a little shining; whorls 4, com- 

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

 stri:', periphery distinctly tubulated ; lip acute. Length, 2 mill. 



Adventure Bank, Mediterranean. 



R. XANTIIIAS, \VatM>n. PI. 67, fig. 71. 



Scarcely rimate, thin, glossy, translucent white, with from J2-16 

 narrow, continuous ribs, vanishing towards the base where' there 



