RINGICULA. 395 



1st Group, lip denticulate {Ringinda s. sir.), contains R. caron^ 



denticulata, encarpof evens. 

 2d Group, lip not denticulate. 

 a. Columellar margin with two folds (Ringiculina Monts.), R^ 



leptocheila, nltida, per acuta, pusilla. 

 h. Columella with three folds, all species not named above and 



below, 

 c. Columella with four folds, R. covformis, salleana. 

 The larger part of the modern representatives of this genus be- 

 long to the section with non-crenulated lip and 3-plicate columella ; 

 they form a group of very closely allied species, many of which can 

 be identified only with great difficulty, unless authentically named 

 specimens are at hand for comparison. The group has been 

 monographically studied by Commandant L. Morlet ; and from his 

 work a large part of the following account has been taken. 



Mediterranean, North Atlantic and West Indian Species. 



R. BucciNEA Brocchi. PL 46, fig. 51. 



Shell minute, subovate, inflated, smooth ; spire short, acute; col- 

 umella triplicate, the folds acute, lip expanded, adnate ; outer lip 

 margined, inflated in the middle, not grooved. (Brocchi). 



Alt. 4-8, diam. 4 mill. 



West coast of France and Spain ; Mediterranean. 



Vohda buccinea Brocchi, Conch. Foss. Subap. ii, p. 645, pi. 4, f. 

 9, 1814. — Auricula buccinea Sowb., Min. Conch, v, p. 100, pi. 465, 

 f. 2. — R. buccinea Desh., An. s. Vert, viii, p. 344. — Morlet, Journ. 

 de Conch. 1878, p. 132, pi. 5, f. 16 ; p. 278, pi. 8, f. 6 (fossil). 



Quite closely allied to R. auricidata, but more globose, with 

 shorter spire, heavier callus, the surface always smooth and shining, 

 {Mori). 



It occurs also in the middle and upper Miocene and lower Plio- 

 cene. 



R. AURicuLATA Menard. PI. 46, figs. 49, 50. 



Shell minute, ovate, inflated, white, smooth; spire short, acute; 

 base emarginate ; columella triplicate, the folds acute; lip ex- 

 panded adnate ; lip margined, callous. Alt. 5"1, diam. 4 mill. 



{Men.). 



Ocean coast of Spain ; Mediterranean; Madeira. 



