282 PROCEEDINGS Of THE NATIONAL MUSEUM. vol. 40. 



truncated posteriorly, rounded abruptly anteriorly, while those on 

 the third cord are decidedly truncated posteriorly, sloping gently 

 anteriorly. The spaces inclosed between the axial ribs and spiral 

 cords form well impressed, squarish pits. In addition to the above 

 sculpture the entire surface of the spire is crossed by exceedingly fine 

 incremental lines and spiral striations. Sutures strongly constricted. 

 Periphery of the last whorl marked by a well developed spiral cord, 

 which is separated from the first suprasutural cord by a space a little 

 wider than that separating the suprasutural from the median cord. 

 The axial ribs continue to and over the peripheral cord and render it 

 feebly tuberculated. Base somewhat concave, marked with a single 

 low broad cord at the insertion of the columella, the space between 

 which and the peripheral cord appears as a broad, concave sulcus; the 

 space limiting the basal cord anteriorly is a feebly impressed groove. 

 Entire surface of the base marked by fine, incremental lines and 

 exceedingly fine, spiral striations. Aperture subquadrate, effuse at 

 the junction of the outer and basal lip, decidedly channeled anteriorly; 

 posterior angle obtuse; inner lip slightly curved and reflected over 

 the base; parietal wall covered with a thick callus. 



The type has eight post-nuclear whorls and measures: Length 3.8 

 mm., diameter 1.6 mm. It and another specimen (Cat. No. 221613, 

 U.S.N.M.) were collected by Mr. Haycock at Bermuda. 



CERITHIOPSIS ARA, new species. 

 Plate 35, fig. 1. 



Shell small, ovoid, dark brown, except the white band which 

 extends over the posterior row of tubercles on the last three whorls. 

 (Nuclear whorls decollated.) Post-nuclear whorls increasing very 

 rapidly in size in the first three whorls, after that almost cylindric, 

 then again somewhat contracted on the last volution. The whorls 

 are marked with two spiral rows of cords, of which the first, which 

 is almost double the width of the other, is at the summit, while the 

 second is immediately above the suture. The space separating the 

 two is almost equal in width to the anterior row of tubercles. In 

 addition to the spiral cords, the whorls are marked with axial ribs, 

 of which 14 occur upon the first and second, 16 upon the third, 18 

 upon the fourth, and 20 upon the penultimate turn. The junctions 

 of the axial ribs and spiral cords form strong tubercles, those on the 

 posterior cord being elongate-oval, having their long axes coinciding 

 with the axial ribs, while those on the anterior spiral cord are much 

 smaller and truncated posteriorly, sloping gently anteriorly. The 

 spaces inclosed between the axial ribs and spiral cords are well 

 impressed oval pits. Sutures small, scarcely differentiated from the 

 depressed sulcus of the spire. Periphery of the last whorl marked by 

 a smooth spiral cord, which is separated from the suprasutural cord 



