RissoiA. 353 



R. PERMiNiMA, Mauzoni. PI. 69, fig. 28. 



Im})erforate, smooth ; whorls 4, yellowish, with oz' without bands 

 of small chestuiit spots, suture margined. Length, 1*25 mill. 



Canaries, Madeira. 



Too closely allied to R. pulcherrima, Jeflfreys. 

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



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

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

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

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



Length, I'G mill. 



Canary and Madeifan Is. 



Perhaps only a variety of R. semisfriata. 



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



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

 Avhorls 4^, a little convex, with well-impressed, margined suture; 

 columella a little twisted, outer lip thin. Length, I'S mill. 



Gulf of Suez. 

 R. scui,PTiLis, Monts. PI. 71, fig. 93. 



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



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



lip a little thickened. Length, 1'5 mill. 



Algiers. 

 Subsection Microsetia, Monts. 1884. 



R. TUEGiDA, Jeffi-eys. PI. 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, Neiv England; (487 fms.) 



R. ohtusispira, Seguenza, R. ohlita, Tiberi, and R. soluta, var. 

 laevis, Sars, are synonyms. 

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



Rimate, thin, semipellucid, corneous, very lightly spirally striate, 



apex obtuse ; Avhorls 4, convex, with deep suture. Length, 2*5 mill. 



Arctic Norivay. 

 R. ABJECTA, Watson. PI. 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 



