356 RISSOIA. 



R. VEXILLATA, Brusina. Mediterranean. 



R. Cossurce. Calcara, R. faseiata, Requien and R. Joenia, Arad. 

 and Benoit, are synonyms. 

 R. MESSANENSIS, Seguenza. Mediterranean. 



Subsection CINGULINA, Monts. 1884. 

 .R. CONCINNATA, Jeffreys. PL 69, fig. 32. 



Imperforate, scarcely rimate, semipellucid, smooth, with remote, 

 very slight incremental stride, whitish, apex obtuse ; whorls 4, con- 

 vex, with deep suture ; aperture nearly circular, outer lip thin. 



Length, 1 mill. 



Mediterranean Sea. 

 R. SOLUTA, Phil. PL 69, fig. 37. 



Scarcely rimate, thin, very smooth ; whorls 4, very convex, the 

 last ventricose. Length, 1 mill. 



Europe. 



R. globosa, Martin, Ms. is a synonym. 



Var. ALBERT, Jeffreys. 



Somewhat larger and thinner, with a more produced and pointed 

 spire. 



Northern Europe. 

 R. MARIONENSIS, Watson. PL 70, fig. 65. 



Thin, smooth, narrowly umbilicated, ruddy horny, apex blunt ; 

 whorls 5, slopingly flattened, slightly convex, with submargined, 

 slightly impressed suture ; lip sharp. Length, 1'85 mill. 



Between Marion and Prince Edward Is. 

 R. PRINCIPIS, Watson. PL 70, fig. 66. 



Imperforate, rather thick, more or less translucent, white, under 

 a thin, caducous, yellowish epidermis; whorls 5, moderately convex, 

 apex blunt, suture rather deep ; lip sharp, patulous. 



Length, 2 mill. 



Between Marion and Prince Edward Is. 



R. ATJSTRALIS, Watson. PL 70, fig. 67. 



Imperforate, thin, smooth, pale horn color, under a thin yellowish 

 epidermis; whorls 5, moderately convex, with slightly impressed 

 suture ; lip sharp. Length, T85 mill. 



Royal Sound, Kerguelen Is. 

 R. PHILOMELA, Watson. PL 70, fig. 68. 



Minutely rimate, subhyaline, white, shining, apex obtuse ; whorls 

 scarcely 5, convexly conical, suture not deep, slightly margined ; 

 outer lip sharp, a little patulous below. Length, 1'45 mill. 



Off Nightingale IsL, Tristan da Cunha. 



