344 RISSOIA. 



R. VILL.E, Issel. PI. 71, fig. 87. 



Bimate, pale corneous or luteous, pellucid, a little shining, 

 smooth, very slightly longitudinally striate ; whorls 5i, convex, 

 suture margined ; peristome a little thickened. Length, 2-2*5 mill 



Gulf of Suez. 

 R. LANTZI, Velain. PI. 71, fig. 83. 



Rather thick, upper whorls subangulated, the last with rounded 

 periphery, with spiral engraved lines; white; lip sometimes slightly 

 thickened externally. Length, 2 mill. 



Is I. St. Paul, Indian Ocean.- 



R. SUBTRUNCATA, Velain. PL 71, fig. 88. 



Thick, solid, imperforate ; whorls 3, apex obtuse, all smooth, 

 white ; lip thickened within. Length, 1 mill. 



Ins. St. Paul, Indian Ocean, 



R. CAZINI, Velain. PI. 71, fig 84. 



White, thick, smooth, imperforate; whorls 5, slightly convex; 

 lip strongly thickened within. Length, 2 mill. 



Ins. St. Paul, Indian Ocean. 



R. AUSTRALIA, Dunker. PI. 71, fig. 81. 



Somewhat thick, subpellucid, corneous ; whorls 6, subconvex, 

 spirally thinly lined, the last whorl with 6-7 lines. 

 Length, 2'4 mill. 



Sydney, Australia. 



R. PURPUREA, Hutton. PI. 71, fig. 89. 



Elongated, with 6 rather flattened, not polished whorls ; corneous 

 brown, becoming purple or purplish red on the spire, with a white 

 sutural band. Length, 2'5 mill. 



New Zealand. 

 Var. SUBFUSCA, Hutton. 



Whorls 5, flattened, smooth, but not polished ; pale brown. 



Length, 3 mill. 



R. CYCLOSTOMA, Tenison Woods. PL 71, fig. 8. 



Scarcely perforate, smooth, opaque, olivaceous or brownish, 

 lighter or whitish colored below the suture, apex obtuse ; whorls 6, 

 flatly convex, thinly striated ; aperture small, rounded, produced. 



Length, 4 mill. 



Tasmania. 



The author describes a variety ROSEA, which differs only in color. 



