POSITION OF FOSSARINA — KESTEVEN. 



321 



Colour — Ground colour brown, with a few splashes of grey on 

 the spire; on the body whorl the grey predominates; umbilical 

 region white. 



Sculpture. — ^Spirals : superiorly there are two riblets, the first 

 (and smaller) close to the suture, the other median ; there are two 

 equal sized riblets on the periphery, the lower of which is seen 



Fis. 31. 



Fig. 32. 



Fig. 30. 



just above the suture on the whorls of the spire; this sculpture 

 decreases in size till it is lost on the apical whorls. The base is 

 sculptured with three equal ribs, and a smaller one defining the 

 umbilical region. Longitudinally the shell is covered with oblique 

 growth stric-e. Mouth oval, oblique, outer lip sharp, sinuated by 

 the basal ribs ; columella short, curved, and reflected over the 

 perforation ; inner lip defined by a thin transparent callous. 



Dimensions. — Max. diara., 8-5 ; minim., 7; height, 4-66 mm. 



Epidermis — None . 



For operculum and dentition see generic description. 



RiSELLOPSis VARIA, var. CARINATA, var. nov. 

 (Figs. 33, 34, 35). 

 Shell rather solid, slightly translucent, depressed trochiform, 

 perforate, of three and a half whorls. 



Colour. — Ground colour pale yellow; 

 viewed from above the yellow is, on 

 the spire, splashed with brown ; on the 

 body whorl these splashes become con- 

 fluent, the area between the carinse is 

 marked like the top of the body whorl, 

 on the base there are a few pale brown 

 streaks at the circumference; the um- 

 bilical region is white. 



Contour. — Depressed trochiform, tabulate. 



Sculpture. — Spirals : two prominent carinse divide the shell into 

 a superior, a peripheral, and a basal area; there are on the superior 

 area two small riblets, one, the smaller, at the suture, the other a 

 little less than a third of the breadth of the area from the suture; 



Figr. 33. 



