186 M. Deshayes' Monograph of Dentalium, 



the base. Strise equal, rounded, sometimes regularly spotted with grey 

 or translucid white upon a dull-white ground ; occasionally the striae are 

 rather larger, less closely set, and with a very fine stria between each of 

 them. Apex usually worn : opening rather oblique ; its margins very 

 cutting. 



Length 1 inch 2 lines. Diameter at the base little more than 1 line. 



17. D. PSEUDO-ENTALis, Lam. D. testd tereti, suharcuatd, acumi- 

 nata, antice Icevigatu, postice costulis sulcata. 

 Foss. in Gallia, apud Grignon, &c. 



Resembles D. Entalis, but besides being smaller and narrower, it is 

 always ribbed at its extremity, while the other is never more than striate. 

 Ribs variable in number, acute, and more prominent at the apex, dimi- 

 nishing insensibly, and becoming lost at about one-third, rarely one-half, 

 of the length of the shell. Opening perfectly round, rather oblique, with 

 very sharp edges. Posterior extremity never cleft, as stated by M. De- 

 france. 



Length from 1 inch to 1 inch 2 lines. 



B. Neither ribbed nor striated longitudinally. 



18. D. Entalis, Linn. D. testd tereti, suharcuatd, Icevigatd, continud, 



alba vel rubescente. 



D. Entalis, Auct. fSowerhy, Min. Conch, t. 70, f, 3.?) 



Var. a. Eadem apice rubescente. 



D. Tarentinum. Lam., Anim. sans vert. v. p. 345, n. 14. 



Var. h. Eadem albida, rubescensve, apice suhtilissim^ striata. 



Habitat in mari Europseo, necnon in Mediterraneo. — Foss. in Gallia, 

 apud Grignon, &c. ; et in Italia. 



Size middling, curvature rather strong ; moderately large at its base, 

 white or greyish, often tinged vdth rose-colour at its apex : entirely 

 smooth, except occasional transverse striae of growth, and in the variety 

 b very minute longitudinal striae, visible only under a magnifying glass, at 

 the posterior extremity. The posterior extremity, which is generally 

 acuminated, is sometimes truncated, forming a plane surface, from the 

 opening of which issues a small tube. Opening at the base rather large 

 and perfectly circular, with cutting margins. 



Length 1 inch 9 lines. Diameter of the base more than 2 lines. 



