366 RISSOIA. 



Section NEVILLIA, A. Ad. 1868. 

 R. PICTA, H. Adams. PI. 66, fig. 53. 



Iraperforate, rather solid, \vith unequal spiral ribs, of which the 

 one on the middle of each whorl is strongest, and minutely longitu- 

 dinally striate; whitish, maculated with chestnut; whorls 5, angu- 

 lated, with distinct suture; columella callous, with an anterior 

 tooth, lip acute, smooth within, varicose externally. 



Length, 2'25 mill. 



Mauritius. 

 R. LUCIDA, H. Adams. PI. 66, fig. 54. 



Rather solid, imperforate. subpellucid, white, with subdistant 

 spiral riblets, and very minute longitudinal striae ; whorls 5, convex, 

 with impressed suture ; columellar tooth and external varix strong. 



Length, 2 mill. 



Mauritius, Isle of Bourbon. 



Section ALVINIA, Monts. 1884. 

 R. WEINKAUFFI, Schwartz. PL 66, fig. 48. 



Imperforate, thin, subpellucid, a little shining, whitish or yellow- 

 ish, clathrate by longitudinal riblets, and much stronger, distant 

 spiral ridges; whorls 6, convex, angulated, shouldered, with deeply 

 incised suture; aperture smooth within, slightly varicose externally. 

 Length, 3 mill. 



Sicily and Algiers. 

 R. dictyophora, Weink. is a synonym. 



R. DICTYOPHORA, Phil. PI. 66, fig. 49. 



Thin, hyaline, dark brown or fulvous, with distant thin longitu- 

 dinal, and stronger, more distant spiral lirse, two of the latter in 

 the penultimate and five in the last whorl; perforate; lip thin. 



Length, 2 mill. 



Sicily. 

 R. PAGODULA, Bucq. Dautz., Dollf. PL 66, fig. 55. 



Imperforate, rather solid, turrited, longitudinally ribbed, spirally 

 strongly ridged, the upper ones forming tubercles; whorls 6, subcari- 

 nate, shouldered, suture deep ; aperture margined. Length, 2 mill. 



Mediterranean Sea. 



It is R. Philippiana and Var. bivittata, Jeffreys, R. scabriuseula, 

 Req. R. Laneice, Mts. and R. tessellata, Schwartz. 



R. CHEILOSTOMA, Tenison-Woods. PL 68, fig. 91. 



Imperforate, solid, dull, yellowish, clathrate by longitudinal and 

 spiral ribs, the former vanishing about the periphery, the latter 



