RISSOIA. 341 



R. LiNCTA, Watson. PI. 09, fig. 47. 



Rather thick, transparent, glossy, white, sometimes with a yellow- 

 ish cast, smooth, barely microscoj)ically striate, more distinctly so 

 at the base; whorls 4-4^, convex, suture deep; peristome sub- 

 continuous. Length, 1-5 mill. 



Madeira. 

 R. L.i.:vis, Monts. PL Gi), fig. 48. 



The only description of this species is " Its solidity and the teeth 

 of the aperture readily distinguislied it from its congeners." The 

 figure does not exhibit any apertural teeth. 



Algiers. 



It belongs to Monterosato's group Peringiella. 

 R. EFiDAuiucA, Brusiua. PI. 69, fig. 49. 



Minute, aciculately-subcylindrical, obtuse, thin, hyaline, very 

 smooth, suture moderate, aperture dilated, with simple peristome. 



Length, l*o mill. 



Dalviatia, Sicily. 



R. SEMINULUM, Monts. 



Like R. glahrata, but larger, aperture more produced, peristome 

 chestnut-margined. 



Algiers. 



Possibly a Barleeia. 

 R. KITEN8, j\Ionts. (unfigured.) Mediterranean. 



Section Anabatheon, Frauenf. 1867. 



R. coNTABULATA, Frauenf. PL 69, figs. 50, 51. 



Thick, shining, reddish or purplish; whorls 62, scalariform, the 

 upper part shouldered, and the angle carinated, there is an inferior 

 carina on the body whorl, suture more or less channeled ; lip thick, 

 continuous. Length, 1'4 mill. 



Botany Bay, Australia. 



Section Pelecydium, Fischer. 1872. 



R. VENUSTULA, Foliu. PL 69, fig. 53. 



Imperforate, white, subpellucid, transversely striate ; whorls 7-8, 

 subplanate, with linear suture, "apex obtuse, mamilliform, last whorl 

 deviately descending ; aperture ])rodueed, exserted, semicircular, 

 entire, peristome subthickened. Length. ? 



Sonda Strait. 



