UKG* i i.\. 



R. SEMI9TRI vr\ < M-hi-ny. IM. L6, fig* 18, II. 



Shell ovate-conic, thick, whiti th p >sterior!y, transversely 



striated in front; spire acute, conic, sutun- irnpn-sed : aperture 

 oblong, columella thickened, biplirate, with n spr.-sidini: port 

 callus ; lip very thick, siihtuherculate in the middle. Alt. *J. dinm. 

 1 mill. (Orb.). 



./'///mica (Cm 



R. semistriata ORB., Moll. Cuba, ii, p. 103, pi. 21, f. 17 



R. NITIDA Verrill. PI. 46, fig. 38. 



Shell small, white, smooth, broad oval, with five whorls, spire 

 rapidly and regularly tapered, sub-acute, shorter than the aperture. 

 Whorls very convex, regularly rounded, the sutures well impn- 

 a well marked, impressed, revolving line just heluw the sutur.- ; the 

 surface otherwise nearly smooth, but with more or less distinct, 

 distant, microscopic revolving lines, most distinct anteriorly. Aper- 

 ture somewhat crescent-shaped. Outer lip evenly rounded, forming 

 the segment of a circle, the border regularly thickened, receeding a 

 little posteriorly, near the suture. Callus on the body-whorl narrow, 

 nearly even, but a little swollen in the middle and slightly rail 

 Columella stout, recurved at the end, with two strong, very promi- 

 nent, equal, spiral folds the anterior one projecting beyond the 

 canal, with the end rounded. Length, 4'2 mill.; breadth, 3*1 mill.; 

 length of aperture, 2*5 mill. ; breadth of aperture, 11 mill. (F.). 



Meditei-ranean in deep water (Monts.) ; Ocean coast of Spain and 

 France, and North Atlantic (Jeffr. and Folin) ; Bed of <;>< 

 447 fms. (Pourtales) ; Yucatan Strait, off Tortugas, off Mnrtlnifjue, off 

 Grenada (Blake); Pliocene of Italy. 



R. n if 'nbi VERRILL, Amer. Jour. Sci. (3), v. p. 16, Jan. 1873 

 (extra copies issued Dec. 13, 1872); Trans. Conn. Acad. iii, p. IN 

 pi. l,f. 2; /. c. v, p. 540. BALL, Bull. ML C. /. br, p. '.'7: xviii 

 (Blake Gastrop.) p. 43. R. leptocheila BRUCVM , Mis.-. Malac. p. 

 11, pi. 1, f. 17, 1873. AGASSI/., Three Cruises of the Blake, ii : 

 f. '_ )( .M. MONTS., Nuova Kivista Conch. Med., p. 40; Joun 

 Conch., 1874, p. 1>79. MORLET, Journ. de Conch.. 1878, p. 131, 

 pi. 5, f. 17. SKGTI \/ \, Atti R. Accad. dei Lincei, Mem., i 

 et seq., figs. 



The synonymous R. leptocheila is shown in fig. 31, pi. 

 Dall writes: I have satisfied mysrlt'hy a comparison ot' authentic 

 specimens, that the species of Verrill and Brugnone are : 



