no. 1823. MOLLUSKS OF THE GENUS CERITHIOPSIS— BARTSCH. 339 



eral one in width. In addition to the above sculpture, the base is 

 marked by weak incremental lines. Aperture irregularly ovate, 

 very strongly channeled anteriorly; posterior angle obtuse; outer lip 

 thin, rendered somewhat sinuous by the external sculpture ; columella 

 stout, curved, and somewhat twisted, the edge reflected; parietal 

 wall glazed with a thick callus. 



The type (Cat. No. 106506, U.S.N.M.) comes from Point Abreojos, 

 Lower California. It has six post-nuclear whorls and measures: 

 Length 2.3 mm., diameter 0.8 mm. 



CERITHIOPSIS (CERITHIOPSIS) BERRYI, new species. 

 Plate 39, fig. 8. 



Shell small, elongate-come, brown. Nuclear whorls four, well 

 rounded, separated by constricted sutures, smooth, forming a mucro- 

 nate apex to the shell. Post-nuclear whorls strongly sculptured, 

 having three spiral cords between the sutures, of which the one at 

 the summit is much smaller than the rest on the early whorls; the 

 other two are subequal in strength, the second one being close to the 

 one at the summit, while the third is almost halfway between the 

 second and the suture. On the last whorl, the cord at the summit is 

 almost equal to the other two. In addition to the spiral sculpture, 

 the whorls are marked by vertical axial ribs which are stronger than 

 the spiral cords. Of these ribs, 12 occur upon the second, 16 upon the 

 third to fifth, 18 upon the sixth, and 20 upon the penultimate turn. 

 The junctions of the axial ribs and spiral cords form strong tubercles, 

 which are truncated posteriorly and slope gently anteriorly. The 

 spaces inclosed between them are elongated, narrow pits between 

 the first and second spiral cords on the early whorls, while on the last 

 they are squarish pits in this region. The spaces between the median 

 and supraperipheral cord are strongly impressed, large, squarish pits 

 on all the whorls. Sutures strongly channeled. Periphery of the 

 last whorl marked by a broad sulcus, equaling that which separates 

 the supraperipheral from the median cord, crossed by the continua- 

 tions of the axial ribs. Base marked by a strong, broad,, rounded 

 cord immediately below the periphery and a second less strong on its 

 middle, while a slender thread encircles the insertion of the columella. 

 In addition to this sculpture, the base is marked by strong, incre- 

 mental lines. Aperture irregularly oval, decidedly channeled ante- 

 riorly; posterior angle obtuse; outer lip thin, showing the external 

 sculpture within, rendered sinuous at the edge by the external sculp- 

 ture; columella stout, curved, strongly twisted, with the edge reflected: 

 parietal wall glazed with a thick callus. 



The type and two additional specimens (Cat. No. 195182, U.S.N.M.) 

 were dredged by Mr. S. S. Berry in 12 fathoms off Del Monte, Monte- 

 rey, California. The type has lost the nucleus, the eight post-nuclear 



