RISSOIA. 353 



R. PERMINIMA, Manzoni. PI. 69, fig. 28. 



Imperforate, smooth ; whorls 4, yellowish, with or without bands 

 of small chestnut spots, suture margined. Length, T25 mill. 



Canaries, Madeira. 



Too closely allied to R. puleherrima, Jeffreys. 

 R. ALBUGO, Watson. PI. 69, fig. 27. 



Scarcely rimate, pellucid, thin, smooth, whitish or yellowish, with 

 series of small quadrate chestnut spots, sometimes confluent, with a 

 series of opaque white spots on the periphery; whorls 5J, sub- 

 angular, spirally sulcate beneath the angle : lip thin, acute. 



Length, 1'6 mill. 



Canary and Madeiran Is. 



Perhaps only a variety of R. semistrmta. 

 R. MADREPORICA, Issel. PI. 71, fig. 86. 



Rimate, thin, a little shining, densely spirally striate, white ; 

 whorls 4i, a little convex, with well-impressed, margined suture ; 

 columella a little twisted, outer lip thin. Length, 1 '3 mill. 



Gulf of Suez. 

 R. SCULPTILIS, Monts. PL 71, fig. 93. 



Shell a little shouldered, smooth, yellowish, with dark colored 

 punctate dots in spiral series, about six series on the body whorl ; 

 lip a little thickened. Length, I'D mill. 



Algiers. 

 Subsection MICROSETIA, Monts. 1884. 



R. TURGIDA, Jeffreys. PL 69, fig. 29. 



Rimate, thin, pellucid, very smooth, white or light yellowish, a 

 little shining, the periphery with a spiral line, apex obtuse; whorls 

 5, convex, the last dilated, suture distinct. Length, 2*2 mill. 



Northern Norway, New England ; (487 fms.) 

 R. obtusispira, Seguenza, R. oblita, Tiberi, and R. soluta, var. 

 laevis, Sars, are synonyms. 

 R. TUMIDULA, Sars. PL 69, fig. 30. 



Rimate, thin, semipel lucid, corneous, very lightly spirally striate, 

 apex obtuse ; whorls 4, convex, with deep suture. Length, 2'5 mill. 



Arctic Norway. 

 R. ABJECTA, Watson. PL 69, fig. 31. 



Subsolid, opaque, yellowish white, unicolored ; whorls 5-8, some- 

 what flatly convex, suture thread-like, slightly channeled, surface 

 very minutely spirally striate. Length, 2 mill. 



Madeira. 

 23 



