RINGICULA. 397 



penultimate longitudinally costellate ; last whorl two-thirds the total 

 length, rounded at base ; spire short ; aperture constricted, margins 

 joined by a thick callus, with the lip forming a canal ; col- 

 umellar margin arcuate, quadri-plicate, the upper fold delicate, 

 lower two delicate, contorted, horizontal ; lip arcuate, thick, provided 

 in the middle with a tooth-like tubercle, more or less prominent. 

 Alt. 4, diam. 3 mill. (Mori.'). 



Mediterranean. 



R. schlumbergeri MORL., J. de C., 1878, p. 204, pi. 9, f. 4. 



Cannot be confounded with any of its congeners on account of the 

 short form, the ornamentation consisting of stride and ribs crossing 

 them, and the fourth fold of the interior. 



R. ADMIRABILIS Morlet. PI. 46, figs. 45, 46. 



Shell globose, thick, delicately striate and costellate, (transverse 

 striae 3-4 on upper whorls, numerous and dense on last whorl ; cos- 

 tellse less conspicuous on back of the last whorl) ; whorls 5, slightly 

 convex, separated by an impressed suture, the last whorl three-fifths 

 the total length, rounded at base ; aperture consiricted, the margins 

 joined by a thick callus; columellar margin quadriplicate, the 

 upper two folds thick, short, the third fold short, contorted, the 

 lower fold delicate and horizontal ; lip little arcuate, thickened in 

 the middle and reflexed outside. Alt. 3'5, diam. 2'5 mill. (Mori'). 



Mediterranean. 



R. admirabilis MORL., Journ. de Conch. 1882, p. 203, pi. 9, f. 3. 



Approaches in its striation the miocene and pliocene R. elegans 

 Pecchioli but it is longer, more finely and closely etriate, and the 

 lowest fold is horizontal. 



R. ABYSSORUM Morlet. Unfigured. 



Shell thin, globulose, of large size, ornamented with transverse 

 striae and very fine and close longitudinal ribs ; the lip peculiar in 

 form. (Mori.}. 



Mediterranean*! (Second Exped. Travailleur, 1881). 



R. abyssorum MORL., Journ. de Conch. 1882, p. 206. 

 R. SALLEANA Morlet. 



Shell small, short, ventricose, thick, shining, ornamented with 

 regular, deep spiral striae; whorls 6, convex, separated by a linear 



