RINGICULA. 



K. SEMISTRIATA Orbigny. PI. 46, figs. 43, 44. 



Shell ovate-conic, thick, whitish, smooth posteriorly, transversely 

 striated in front; spire acute, conic, suture impressed; aperture 

 oblong, columella thickened, biplicate, with a spreading posterior 

 callus ; lip very thick, subtuberculate in the middle. Alt. 2, diam.. 

 1 mill. (Orb.). 



Jamaica (Cande) 



R. semistriata ORB., Moll. Cuba, ii, p. 103, pi. 21, f. 17-19. 



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 impressed ; 

 a well marked, impressed, revolving line just below the suture ; 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 raised, 

 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, 31 mill. ; 

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



Mediterranean in deep water (Monts.) ; Ocean coast of Spain and 

 France, and North Atlantic (Jeffr. and Folin) ; Bed of Gulf Stream, 

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

 Grenada (Blake); Pliocene of Italy. 



R. nitida VERRTLL, Amer. Jour. Sci. (3), v. p. 16, Jan. 1873 

 (extra copies issued Dec. 13, 1872) ; Trans. Conn. Acad. iii, p. 48 r 

 pi. 1, f. 2 ; /. c. v, p. 540. DALL, Bull. M. C. Z. ix, p. 97 ; xviii 

 (Blake Gastrop.) p. 43. R. leptocheila BRUGNONE, Misc. Malac. p. 

 11, pi. 1, f. 17, 1873. AGASSIZ, Three Cruises of the Blake, ii, p. 70 

 f. 291. MONTS., Nuova Rivista Conch. Med., p. 45; Journ de 

 Conch., 1874, p. 279. MORLET, Journ. de Conch., 1878, p. 131, 285, 

 pi. 5, f. 17. SEGUENZA, Atti R. Accad. dei Lincei, Mem., ix, p. 344, 

 et seq., figs. 



The synonymous R. leptocheila is shown in fig. 31, pi. 46. 

 Dall writes: I have satisfied myself by a comparison of authentic 

 specimens, that the species of Verrill and Brugnone are the same, 



