122 BULLETIN 111, UNITED STATES NATIONAL MUSEUM. 



CADULUS (PLATYSCHIDES) PROVIDENSIS, new species. 



Plate 18, fis. 14. 



The shell is moderately curved, rather slender and markedly 

 swollen at about the anterior two-fifths, especially on the convex side, 

 and has an obtusely angled equator. It is very little compressed. 

 The aperture is very oblique, with rounded peristome. The convex 

 outline forms an even arc to the equator, thence becomes a straighter 

 line along a somewhat flattened surface to the anterior aperture. The 

 concave side shows its chief curvature in the posterior one-fourth, 

 with an almost straight outline the balance of the way, though bulged 

 out somewhat at the equator. The lateral sides converge to the 

 rather broad apical end and to the broader aperture at about the 

 same angle. Details of the apical characters are not plain, but the 

 convex side of the rim projects slightly in an obtusely angled lobe, 

 while the opposite side tends to flare out, the lateral portions being 

 broadly notched. 



The type. Cat. No. 94055, U.S.N.M., measures— length, 8.5 mm.; 

 diameter, 1.80 by 1.50 mm.; anterior aperture, 1 mm.; apical aper- 

 ture, 0.6 mm. It was dredged at the U. S. B. F. Station 2150, off 

 Old Providence Island, in 382 fathoms, bottom of white coarse sand, 

 temperature 45.75° F., from a lot of three specimens. 



Another lot of 14 specimens. Cat. No. 108176, U.S.N.M., is from 

 the U. S. B. F. Station 2668, off Fernandina, Florida, in 294 fathoms, 

 sand, 46.3° F. None of these specimens is good, but they seem to 

 be referable to Cadulus iwovidensis. 



This species probably differs but slightly from Watson's vulpidens, 

 taken by the Challenger in 390 fathoms, off Culebra. The chief 

 difference lies in the position of the equator, wliich in the form here 

 described is more nearly central. They both belong to the same 

 group of ''wolf-tooth" species, a bent appearance caused by the 

 obhquity of the aperture and the obtusely angular equator. It is 

 larger than either Cadulus amiantus or C. busJiii. 



The following four species may be grouped together upon the 

 common features of extreme length and slenderness with a markedly 

 anterior position of the equator: C. elongatus, C. greemlawi, C. arctus, 

 and C. hraziliensis. 



CADULUS (PLATYSCHIDES?) ELONGATUS, new species. 



Plate 19, fig. 15. 



The shell is exceedingly long and slender, slowly tapering from a 

 very small apical orifice to the equator, which is placed at about 

 the anterior one-fifth, and unmarked by local swelling. The convex 

 outhne is regularly curved to the equator, thence is almost straight 

 to the anterior aperture. The concave outhne is regularly curved 

 in the posterior half, but almost straight anteriorly with a just per- 



