RINGICULA. 399 



R. SEMI8TRIATA 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. {Orh.). 



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, 3'1 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 Martimqae, 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,. 

 pi. 1, f. 2; /. c. V, p. 540.— Ball, 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,. 



