162 ANACHTS. 



C. PURA, Verrill. 



This shell is very abundant in many of our deeper dredgings, 

 on muddy bottoms. It resembles the shallow water species, 

 C. zonalis (= G. dissimilis, Stirnp.), in form, except that it is 

 somewhat shorter and stouter, with the whorls more convex, the 

 columella more excavated, the aperture a little wider and the 

 canal slightly bent back at the tip, but the shell is translucent 

 and glossy, and the color is pure white or pinkish white, except 

 near the apex, where it is tinged with pale brown or pink, in 

 fresh specimens. The surface is smooth, except slight lines of 

 growth and a few faint spiral lines, on the canal anteriorly. The 

 nucleus is distinctly larger than in the typical C. zonalis. It is 

 probable that this form is a distinct species. 



Off Martha 1 8 Vineyard, 100 to 487 fms., 1880,1881 (U. S. Fish Comm. ) ; 

 off Chesapeake Bay, 300 fathoms (Capt. Tanner). Abundant. 



The above is a copy of Prof. Yerrill's description. 



C. YERRILLT, Dall. 



Shell slender, conical, yellowish white, whorls seven ; polished, 

 but covered when fresh by a shaggy brown epidermis, which is 

 irregularly lamellated ; nucleus naticoid, shining translucent white ; 

 ten or twelve close spiral lines on the pillar and basal surface, 

 with occasionally microscopical spiral lines on other parts of the 

 shell ; longitudinal sculpture consisting in some specimens of 

 nine to fourteen plications, stronger at the posterior end on each 

 whorl, forming there slight tubercles which form a waved sutural 

 line in others the sculpture is fainter, not tuberculate at the 

 suture, and becoming evanescent on the larger whorls at a short 

 distance in advance of it; pillar stout, a little twisted, and with 

 the canal distinctly recurved, with a smooth white callus ; outer 

 lip slightly thickened and reflected, somewhat contracted anter- 

 iorly to form the short wide canal, and having internally about 

 midway between its junction with the body-whorl and the canal 

 a single small rounded pustule-shaped callus ; there are no other 

 denticles except this, which is invariably present in adult 

 specimens. 



L. 9, of last whorl 5, of aperture 3'5 mill. ; max. lat. 3, of 



aperture 1*5 mill. 



Caribbean, 331 to 805 fathoms. 

 The above is one of the numerous new species discovered in 



