RISSOIA; 351 



Section Ceratia, H. and A. Adams, 1854. 



K. PROxiMA, Alder. PI. 63, fig. 82. 



Somewhat solid, a little shining, semipellucid, yellowish white ; 

 M'horls 6, convex, with impressed suture, almost smooth, very 

 slightly spirally striate ; lip a little thickened, but not varicose. 



Length, 3 mill. 



Europe. 



R. striatula, Jeffi^eys and probably R. pupoides, Requien, are 

 synonyms. 



R. MACRA, \yatson. PL 64, fig. 99. 



Imperforate, thick, subtransparent W'hite, apex obtuse; whorls 6, 

 rather flat, with narrowly margined suture, and slight spiral striie ; 

 outer lip sharp, very feebly varicose. Length, 2'5 mill. 



Off Nightingale Isl., Tristan da Cunha; 100-150 fms. 



R. TRUNCATA, Garrett. PI. 63, fig. 79. 



Imperforate, thin, pellucid, shining, white, apex blunt ; whorls 5, 

 slightly convex, closely spirally striate ; peristome thick, slightly 

 expanded. Length, 2 mill. 



Viti Is. 



Unfigured Species. 



R. PYRGULA, A. Ad. Gidf of Suez. 



R. Maccoyi, Tenison Woods. Tasmania. 



R. VARIEGATA, Tapparone. Papuan Is. 



Section Hy^ala, H. and A. Adams. 1854. 



R. YITREA, Mtg. PI. 63, fig. 81. 



Imperforate, thin, semipellucid, yellowish white, smooth, very 

 lightly spirally striate, apex obtuse ; whorls 6, convex, oblique, with 

 deep suture ; lip simple, thin, contracted. Length, 4 mill. 



Europe. 



It is R. glabrata, Fleming, R. crystallina and R. virginea, Brown . 



Unfigured Species. 



R. coNciNXA and R. nitida, A. Ad. Gulf of Suez. 



R. puMiLA, A. Ad. Gulf of Suez, Japan. 



R. GLABRATA, Phil. Japan. 



