RISSOINA. 375 



flatly convex, subturreted, with impressed, undulated suture; lip 

 varicose. Length, 5 mill. 



West Indies. 

 It is R. Dunkeri, Pfr. teste Weinkauff. 



K. DISTANS, Anton. PL 56, fig. 56. 



Solid, white, shining, with 12 strong, rounded, longitudinal ribs, 

 the interstices scarcely striate; whorls 7, slightly convex, suture 

 undulated; lip varicose. Length, 9 mill. 



Philippines. 



R. canaliculata, Schwartz is a synonym. 



R. PLICATA, A. Ad. PL 56, fig. 58-60, 68 ; PL 54, fig. 8, 



Whitish, strongly, but narrowly, distantly plicate, the shallow, 

 concave interstices spirally striate; whorls 8, subangulated above 

 and below the suture, the sides flattened; lip somewhat varicose. 

 Length, 5'6 mill. 



Philippines, Red Sea, Mauritius. 



The synonymy includes R. scalariformis, Schwartz, not C. B. Ad. 

 (fig. 68), R. Bertheloti, Audouin, R. dentioulata, Mohrenstern (fig. 

 59), and R. sealarina, A. Ad. Reeve's figure of the latter species 

 (fig. 8). is a very poor one, evidently. Probably R. subangulata, 

 Schwartz, (fig. 60) is also to be added to the synonymy of the present 

 species, as the chances are that it is not properly identified by 

 Schwartz as Adams' species and the differential characters are of 

 little or no importance. 



R. subangulata, C. B. Ads. is a Jamaica species, and unfigured. 



R. ANGULATA, Jickeli. PL 56, fig. 50. 



Rather solid, white, a little shining, longitudinally costate, costse 

 sinuate in the middle, thickened above and below, with two scarcely 

 conspicuous spiral ribs at the base ; whorls 6 ?, suture undulated ; 

 lip obtuse. Length, 2 mill. 



Red Sea. 



R. BURDiGALENSis, d'Orb. PL 56, fig. 53. 



With about 12 longitudinal ridges, and much wider, shallow, 



concave interstices, spirally lirate, fimbriating the tops of the 



ridges; whorls 7-8, subscalariform, somewhat shouldered or tur- 



reted, suture undulated ; lip with striate varix. Length, 7%3 mill. 



Fossil in the Vienna Basin, etc. ; living at Mauritius. 



The identification of d'Orbigny's fossil with the recent species is 

 on the authority of Schwartz. 



