136 K. J. Bush — Marine Gastropods referred to 



Aperture very oblique, somewhat ovate. Peritreme simple, contin- 

 uous, modified on the body-whorl into a thin glaze, sometimes in the 

 adult having a free edge ; strongly sinuate along the umbilical 

 region and anteriorly, slightly angulated below, at the junction of 

 the two lips; above, arching well upward, forward, then backward 

 from the body-whorl forming a distinct sutural notch. 



Interior of the aperture smooth and very lustrous, with the con- 

 spicuous, exterior, transverse lines showing through by transparency. 

 There is no internal opaque line ; in all the specimens the operculum 

 is drawn well into the shell. 



The operculum is very thin, circular, of a delicate horn-color, with 

 central nucleus, of about seven whorls defined by a fine spiral line. 



The animal of the type species is too much dried to dissect, the 

 shell being removed by hydrochloric acid, but the radula shows 

 exceedingly interesting .features. The entire length is but about 

 •35™™ and the width about "OS™". It consists of numerous rows of 

 very delicately colored teeth. In each row there is a long, rather 

 broad, strongly hooked median tooth ; on either side, three or four 

 lateral ones of about equal size ; all of these, when seen in profile, 

 appear distinctly triserrate and the outer ones somewhat larger than 

 the others ; beyond, there is a series of between 80 and 40, long, very 

 slender, marginal hooks. 



Type, Iieptogyra Verrilli sp. nov. 

 Plate XXIII. figs. 13, 13a. 



Shell consisting of three whorls which form a moderately elevated 

 spire with obtuse apex due to the scarcely raised nuclear whorl. 

 The surface, below the nucleus, is covered with microscopic^ 

 impressed, spiral lines, and more conspicuous, sinuous, raised, irregu- 

 lar, transverse lines or wrinkles which are most distinct near the 

 suture and upon the upper part of the whorls, in addition to the 

 very fine lines of growth ; on the middle of the body- whorl and on 

 the base, the spiral striae become broader so that the alternating 

 spaces appear like raised threads. Operculum and radula described 

 under the genus. 



Greatest diameter of one of the largest specimens, about 1-5'"™; 

 height, about -9'"™. 



Eight live specimens, station 21'74, off Delaware Bay, in 1594 

 fathoms, 1884. 



