338 RISSOIA. 



evanescent on lower part of body-whorl, where the spiral sculpture 

 becomes more prominent ; lip thickened. Length, 5 mill. 



Europe. 



The synonyms are R. cyclostomata, Recluz, and R. scalariformis, 

 Thorpe. Jeffreys adds R. carinata, Aradas, and R. canaliculata, 

 Phil. 



R. CRISP A, Watson. PL 65, fig. 8. 



Rim ate, rather solid, somewhat shining, subvitreous, white, a 

 little orange-tinted, with about 12 oblique costse, vanishing below, 

 crossed by spiral lirse, of which there are 7 on the last whorl, 

 stronger below, the intersections crispate ; whorls 5-6, convex, gra- 

 date, suture deep ; lip thickened, externally crenated. 



Length, 2 mill. 



Madeira, Canaries. 

 R. MAYENI, Friele. PL 65, fig. 28. 



More or less rimate, solid, reddish brown ; whorls 5, carinate, 

 with sloping shoulders, costate above, nodose at the carina, spirally 

 lirate below. Length, 5 mill. 



Arctic Ocean. 



First published as R. Jan-Mayeni; subsequently simplified as 

 above. 



Friele has described a var. ALBA. 



R. SIMULANS, Monts. Unfigured. (jR. Watsoni, Monts., not 

 Schwartz.) Mediterranean. 



Section FOLINIA, Crosse, 1868. 



R. INSIGNIS, Folin. PL 63, fig. 70. 



Turreted, distantly obliquely ribbed, the extremities of the ribs 

 undulating the shoulder of the whorls, spirally striate ; whorls 5, 

 rapidly increasing ; lip wide, outer margin crenulated. 



Length, 2-2 mill. 



Panama. 



The remarkable distinctive character of this group is the small 

 posterior sinus of the aperture. 



R. PHARAONICA and R. CLEOPATRA, Folin (unfigured.) Egypt. 



