i 



112 



BULLETIN 111, UNITED STATES NATIONAL MUSEUM. 



' 



CADULUS (PLATYSCHIDES) CATHARUS, new species. 



Plate 18, %. 5. 



The shell is rather solid, moderately curved, with its maximum 

 diameter almost exactly median, where it is slightly bulged with just 

 a suggestion of a bluntly carinated equator. The anterior aperture 

 is very oblicjue, dorso-ventrally oval; its peristome is sharp, slightly 

 constricted, and bordered on the outside by a flattened space as 

 though "hollow ground. " Within, it is encircled by an opaque white 

 callus. The posterior orifice is relatively large, somewhat flaring, and 

 a little flattened. The convex arc describes a regular curve unmodi- 

 fied by the equatorial expansion. The concave arc is reduced to an 

 almost straight line, interrupted only by a slight bulge at the median 

 equator. The posterior portion of the shell is not attenuated but 

 free and large. Apical features, while not w^ell shown in the type, 

 are probably typical of the subgenus. 



The type is in the State University of Iowa collection and was 

 dredged by the expedition of that university of 1898, at the S. U. I. 

 Station 115, oft' English Harbor, Antigua, in 120 fathoms. It meas- 





