RISSOIA. 383 



R. PULCHELLA, Phil. PL 62, figs. 53, 54. 



Subperf orate, obliquely subdistantly plicate, last whorl with the 

 plicae short, or smooth ; yellowish, with fulvous flames between the 

 ribs, often unimaculate on the base of the lip. Length, 2*3 mill. 



Mediterranean /Sea. 



R. RADIATA, Phil. PI. 63, fig. 55. 



Imperforate, thin, hyaline, yellowish brown, irregularly fasciate, 

 and strigate between the ribs with chestnut, lip with a chestnut 

 spot ; with or without a few obtuse ribs, vanishing at the periphery. 



Length, 4'2 mill. 



Mediterranean, England* 



It is R. parva, Jeffreys, R. undata, Bivona. 



Var. SIMPLEX, Phil. 



Very smooth, white or yellowish, with undulating chestnut longi- 

 tudinal lines. 



R. AMELIA, Watson. PL 67, fig. 74. 



Narrowly umbilicated, thin, glossy, horny white, with about 20 

 rounded, wavy ribs and narrower furrows, vanishing at the peri- 

 phery, below it spiral threads; whorls 5J, moderately convex, with 

 impressed suture, periphery very obsoletely angulated ; outer lip 

 thin. Length, 2'25 mill. 



0/Palma, Canaries; 1125 fms. 



R. ALGERIANA, Monts. PL 65, fig. 20. 



Imperforate, with rounded longitudinal ribs and about equal in- 

 terspaces, yellowish brown, with a brown subsutural band and 

 three more on the base ; lip simple, sharp. Length, 3 mill. 



Algiers. 



Monterosato remarks that it belongs to the same group as R. 

 Montagui, and Weinkauff thinks it will prove a variety of that 

 species. 



Var. RUFULA, Monts. 

 Uniform reddish brown. 



R. PINNAE, Krauss. PL 68, fig. 88. 



Imperfonite, somewhat solid, shining, white, lineolate with chest- 

 nut, with 8-9 obtuse, remote longitudinal ribs, and obsolete spiral 

 striae; whorls 7, convex, with impressed suture; lip acute. 



Length, 5'8-6 mill. 



Cape of Good Hope, on byssus of Pinna. 



