384 



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 strise ; lip white-varicose. 



Length, \'S 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, oi' 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 Seaf 



A very variable S})ecies ; it is R. Benzi, Aradas & Benoit, R. 

 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- 

 cnlations. 



R, marginata, Mich. PI. 63, fig. 63. 



Solid, shining, narrowly, rather distantly costulate, sutui'e sub- 

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

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



Length, 5 mill. 



Mediterran ean Sea. 

 R. an«ui>ata, Jettreys. PI. 65, fig. 16. 



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

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

 striae, periphery distinctly angulated ; lip acute. Length, 2 mill. ■ 



Adventure Bank, Mediterranean. 



R. XANTHiAs, Wat-on. PI. 67, fig. 71. 



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

 uiirrow, continuous ribs, vanishing towards the base — where there 



