CADULUS. 157 



C. OVULUM (Philippi). PI. 32, fig. 40, 41. 



Shell egg-shaped, inflated in the middle, more convex on one side, 

 very smooth ; apertures circular and subequal. Length 3, diam. 2 

 mill. (Phil.) 



Bay of Naples (Acton) ; Bay of Biscay (Travailleur Exped., 

 1880) ; Pliocene of Calabria and Sicily ; Miocene, Piedmont. 



Dentalium ovulum PHIL., Enum. Moll. Sicil., ii, p. 208, pi. 27, f. 

 21 (1844) ; Handbuch der Conch, u. Malac., p. 222 (1853). O. G. 

 COSTA, Fauna di Napoli, p. 56, pi. 4, f. 3. C. ovulum JEFFREYS, 

 Ann. Mag. N. H. (5), vi, p. 375 (1880) ; P. Z. S, 1882, p. 666.- 

 MONTS., NuovaRivista Conch. Med., p. 21. C. ovulusSACCO, Moll. 

 Terr. Terz. Piedm. e Ligur., xxii, p. 115, pi. 10, f. 59-63. 



This species is the type of the genus Cadulus. Philippi remarks 

 substantially as follows : Shell cask shaped, narrow at both ends, 

 almost circular in transverse section. Greatest thickness not in the 

 middle, but a little nearer the anterior end, which is obliquely 

 truncated and with a circular aperture T\ of a line wide and sur- 

 rounded by a simple peristome. The orifice at the posterior end is 

 A wide, contracted, with a margin within, the peristome incised 

 and crenate. The affinity to D. coarctatum is evident, but the much 

 shortened form and large posterior aperture indicate a new genus 

 which may be called Cadulus. 



A var. gibba from the Calabrian Pliocene is described by Segu- 

 enza, Form. Terz. Prov. Eeggio (Calabria), p. 276, 1880. 



C. CYATHUS (Cristofori & Jan.). PI. 32, figs. 36, 37, 38, 39. 



Shell small, thin, but rather solid, short, very much inflated in 

 the middle or slightly nearer the aperture, the inflation less on the 

 dorsal side (fig. 37) ; rapidly tapering toward each end. Surface 

 glossy, without visible growth striation. Aperture (fig. 36) rounded 

 oval, slightly wider than long, somewhat oblique, its diameter about 

 half that of the widest part of the shell ; peristome simple, thin. 

 Anal orifice not much smaller than the aperture, round-oval, not 

 oblique, with a wide callous ring or shelf just within the edge, con- 

 tracting the orifice (fig. 38). 



Length 2*2, antero-posterior diameters, aperture 0'58, greatest 

 1-21, apex 0'5 mill. ; lateral diameters, aperture 0'63, greatest 1'21, 

 apex 0-66 mill. 



Italy and Sicily ; Pliocene of Sicily and Calabria. 



