1897.] NATURAL SCIENCES OF PHILADELPHIA. 473 



Exceedingly similar to C. dentalinus Guppy, of the Jamaican 

 Oligocene, 7 but easily distinguished by the lack of circular riblets 

 upon the smaller half of the tube. It differs in form from all of 

 the smooth species of the same group. We have examined a great 

 many specimens. 



This is Gadus dominguensis of Gabb's paper ; not of d'Orbigny. 



Cadulus elegantissimus n. sp. PI. XI, figs. 28, 29, 30. 



Shell similar to the preceding, but larger, much more elongated. 

 Tube compressed vertically, very obliquely but indistinctly striated, 

 glossy. Greatest diameter close to the aperture ; contraction rather 

 slight. Aperture oval ; anal orifice oval, nearly circular. 



Length 11*75 mm.; greatest antero-posterior diameter of tube 

 065 mm. 



A smaller specimen measures, length 8*75, greatest antero-poste- 

 rior diam. 07 mm. 



Two perfect specimens and several broken ones were included by 

 Gabb in his lot of " Gadus dominguensis" It is excessively slen- 

 der, quite arcuate, and decidedly longer and larger than G. denta- 

 linus Guppy. The measurements are from the largest of the un- 

 broken shells. Fragments indicate that somewhat larger individuals 

 occur. 



Cadulus depressicollis n. sp. PI. XI, figs. 25, 26, 27. 



Shell long and slender, arcuate, much compressed between the 

 concave and convex sides throughout. Regularly and slowly en- 

 larging from the apex nearly to the aperture, then noticeably con- 

 tracted on all sides ; on the middle of the convex side having a 

 distinctly depressed, concave area about one-third the width of the 

 shell, and extending from the peristome backward a distance about 

 equal to the greatest diameter of the aperture; surface smooth and 

 glossy. Aperture oblong ; apex oblong, simple, with subcircular 

 orifice. 



Length 11*75 mm.; greatest diam. of tube 1*63, least diam. at 

 same point 1*25 mm. ; aperture, greatest diam. 1*06, least 0*8 mm. 



This was one of the four species discriminated, upon separating 

 Gabb's tray of Gadus dominguensis into its elementary constituents. 

 With Cadulus dentalinus Guppy, C. dominguensis d'Orb., and the 

 various forms associated with it, C. depressicollis has no close rela- 

 tionship. It is slender for a Cadulus, and remarkable for the 



'Manual of Conchology, XVII, PI. 36, figs. 1, 2. 



