^36 RISSOIA. 



wider interspaces, no spiral sculpture ; whorls 4, the apex blunt, 

 the others very convex, with deep suture ; lip rather thin, without 

 a varix. Length, 2"3 mill. 



Off New England ; deep sea. 

 R. HARPA, Verrill. PI. 67, fig. 82. 



Urabilicated, thin, with numerous longitudinal plications, and no 

 spiral sculpture ; wliorls 5, very convex, rapidly increasing, with 

 deep suture; aperture small, round, lip thin. Length, 3 mill. 



Off New England ; deep s^ft. 



H. MUNDA, Monts. (unfigured.) Sicily. 



Section Manzonia, Brusina. 1870. 



R. cosTATA, Adams. PI. 63, fig. 66. 



Longitudinally, distantly costate, costse acute, elevated, nodose 

 above, spirally densely lirate ; whorls convex, round-shouldered, 

 suture deeply incised ; lip double, continuous, the internal smooth, 

 rounded, the external widely reflexed, thinly sulcate. 



Length, 3 mill. ; 



Europe. 

 The synonyms are B. e.cigua, Mich., R. carinata, Phil., Turbo 

 plicatus, Miihlf., Turbo albus, Donovan. 



R. SiBiRicA, Leche. PI. 65, fig. 21. 



Turreted, elevated, brownisli ; whorls 5, round-shouldered, with 

 9-10 obtuse ribs, vanishing on upper part of body whorl, below are 

 a few raised spiral lines ; lip simple, edentulous. Length, 5 mill,-' 



Arctic Ocean, Siberia. 

 R. MiRABiLis, Manzoni. PL 65, fig. 22. 



Scalariform, subangulate in the middle, narrowly rimate ; whorls 

 62, very convex, with deep suture, with narrow, distant longitudi- 

 nal ribs, the wider interstices closely spirally striate; yellowish 

 violet. Length, 2-5 mill. 



Canary Is. 

 R. GIBBER, Watson. PI. 65, figs. 23, 24. 



Widely umbilicated, gradate, solid, white or yellowish, sometiines 

 more or less distinctly four banded with chestnut ; whoids 4-2-5, 

 convex, with stout, rounded ribs, forming an undulated shoulder or 

 suture above ; umbilicus defined by a rib; lip continuous, duplicate. 



Length, 2 mill. 



Madeira and Pto. Sancto. 



