RISSOIA. 367 



continued, and more conspicuous on the base ; whorls 7, with deep, 

 lirate suture, aperture conspicuously bilabiate. Length, 3 mill. 



Tasmania. 

 R. MAURITIANA, Martens. PI. 66, fig. 35. 



Kather thick, white, strongly, rather closely, longitudinally ribbed 

 throughout, crossed by spiral ridges, forming spiral series of nodules, 

 of which there are two on the penultimate and five or six on the 

 last whorls; whorls 4, convex; peristome thickened, simple. 

 Length, 1-5 mill. 



Mauritius. 

 R. VENUSTA, Garrett. PL 68, fig. 90. 



Shell imperforate, solid, vitreous, shining, white, with strong 

 compressed spiral ridges, of which there are 5 on the body whorl 

 and 2 on the spire, crenulated by close, less conspicuous, longitudi- 

 nal, rounded riblets; whorls about 7, convex, with deep, margined 

 suture; lip very thick, varicose. Length, 3*5 mill. 



Viti Is. 

 Section GALEODIXA, Monts. 1884. 



R. STRTATULA, Montagu. PL 66, fig. 58. 



Rather solid, opaque, yellowish white, thinly longitudinally 

 striate in the interstices between much stronger spiral ridges, which 

 carinate and shoulder the whorls; aperture a little dilated below, 

 smooth within, ridged-varicose externally. Length, 4*5 mill. 



Europe. 



R. Russinoniaca, Locard, R. labiata, Phil. R. trochlea, Mich., and 

 R. carinata, Da Costa, are synonyms. 



R. CONSOCIELLA, and R. ELECTA, Mts. (Unfigured). Mediterranean. 



Section THAPSIELLA, Fischer. 1884. 

 R. BUDIS, Phil. PL 66*fig. 59. 



Hyaline, sometimes faintly strigate with chestnut, spirally striate, 

 spire and upper part of body whorl longitudinally, Father faintly 

 costate; whorls 6, somewhat convex; lip simple, plain within and 

 without. Length, 2*6 mill. 



Mediterranean Sea. 

 P. FREMENVILLEI, Audouin. PL 67, fig. 66. 



Imperforate, shining, white, with longitudinal subdistant ribs, 

 fading out on upper part of body whorl, closely spirally striate 



