no. 1823. MOLLUSKS OF THE GENUS CERITHIOPSIS— BART8CH. 353 



between them are moderately large, rounded pits. The last whorl 

 is considerably contracted anteriorly, which gives the oval outline to 

 the shell. Sutures strongly channeled. Periphery of the last whorl 

 marked by a strong, spiral cord, which is smooth. Base moderately 

 produced, bearing a strong, spiral cord at the insertion of the col- 

 umella. Aperture small, irregularly ovate, very strongly channeled 

 anteriorly ; posterior angle obtuse ; outer lip thick within, thin at the 

 edge, rendered sinuous by the external sculpture; columella mod- 

 erately long, stout, twisted, revolute and reflected. 



The type (Cat. No. 195186, U.S.N.M.) has seven post-nuclear 

 whorls and measures: Length 2.5 mm., diameter 1.0 mm. It was 

 dredged at U. S. Bureau of Fisheries station 2813, in 40 fathoms, on 

 coral sand bottom, bottom temperature 81°, off the Galapagos 

 Islands. 



CERITHIOPSIS FOSSILIS, new species. 



Plate 38, fig. 3. 



Shell elongate, subcylindrical. (Nuclear whorls decollated.) Post- 

 nuclear whorls almost flattened, marked by three equal and equally 

 spaced tuberculated spiral cords, of which one is at the summit, 

 another at some little distance above the periphery, while the third is 

 median between the two. In addition to the spiral cords, the whorls 

 are crossed by almost vertical axial riblets which are as strong as the 

 spiral cords and render them tubercular at their junction. Of these 

 ribs 26 occur upon the penultimate turn and the one preceding it, 

 24 on the next two, 22 upon the next, and 20 upon the first of the 

 remaining turns. The spaces inclosed between the spiral cords and 

 axial ribs are strongly impressed, rounded pits. Sutures moderately 

 constricted, showing the posterior edge of the first basal cord as a 

 slender thread in all of the whorls. Periphery of the last whorl 

 marked by a channel, which is as broad as those that separate the 

 spiral cords on the spire and like them crossed by the continuation of 

 the axial ribs. Base short, almost concave near the columella, marked 

 by three equal and equally spaced spiral cords. Aperture (?) de- 

 cidedly channeled anteriorly; posterior angle acute; outer lip frac- 

 tured; columella, stout, curved, and twisted. 



The type (Cat. No. 195193, U.S.N.M.) has seven whorls remaining, 

 and measures: Length 7.2 mm., diameter 2.6 mm. It comes from 

 the Lower San Pedro Series of Dead Man's Island, California. 



CERITHIOPSIS GLORIOSA, new species. 



Plate 36, fig. 7. 



Shell elongate-conic, flesh-color, variegated with flecks of brown; 

 the early whorls are light brown, while the base is dark chestnut. 

 (Nuclear whorls decollated.) Post-nuclear whorls marked by three 

 80796°— Proc.N. M. vol . 40— 1 1 23 



