30 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.65 



rounded and smooth. Postnuclear whorls well rounded, narrowly 

 shouldered at the summit, marked by strong, decidedly retractively 

 slanting axial ribs, of which 18 occur upon the first, 20 upon the 

 second, 22 upon the third, and 26 upon the last turn. In addition to 

 the axial ribs, the whorls are crossed by 4 equal and equally spaced 

 spiral cords, which are about as wide as the spaces that separate them. 

 The first of these is at the summit. The intersection of the axial ribs 

 and spiral cords forms strong, rounded tubercles which have their 

 long axes, which are only slightly greater than the shorter, parallel 

 with the spiral sculpture. Periphery of the last whorl marked by a 

 spiral cord, which falls partly in the suture on the last two turns. 

 Suture not channeled. Base moderately long, well rounded, with a 

 narrow umbilical chink, marked by 10 spiral cords, which become suc- 

 cessively narrower and closer spaced from the periphery to the um- 

 bilical chink. Aperture ovate ; posterior angle acute ; outer lip thin ; 

 inner lip strongly curved and decidedly reflected and appressed to the 

 base, provided with a rather strong fold at the insertion of the colum- 

 ella; parietal wall covered with a rather thick callus, which alone 

 renders the peritreme complete. 



Type — Cat. No. 352515, U.S.N.M., has 5 postnuclear whorls and 

 measures: Length, 3.2 mm.; diameter, 1.4 mm. 



The present species is related to the recent group of which 

 Odostomia {Chrysallida) ienthina and 0. {C.) promeces are mem- 

 bers. 



An additional specimen is in the Oldroyd collection. 



ODOSTOMIA (CHRYSALLIDA) SCELERA, new species. 



Plate 1, fig. 4. 



Shell elongate conic, yellowish white. Nuclear whorls small, 

 deeply, obliquely immersed in the first of the postnuclear turns, 

 above which the tilted edge of the last volution only projects. Post- 

 nuclear whorls strongly shouldered at the summit, marked by very 

 strong, retractively slanting axial ribs, of which 14 occur upon the 

 second and third, 16 upon the fourth, and 20 upon the last turn. In 

 addition to the axial ribs, the whorls are marked by 4 strong spiral 

 cords, which are not quite equal to the axial ribs in strength, and 

 which render the junction with the axial ribs strongly nodulose, the 

 nodules being a little longer than wide. The spaces inclosed between 

 the axial ribs and spiral cords are rectangular pits. Periphery of 

 the last whorl marked by a strong cord, separated from the last cord 

 on the spire by a channel as wide as that separating the other cords 

 of the spire, and crossed by the continuations of the axial ribs which 

 terminate at the posterior border of the peripheral cord. Suture 

 strongly channeled. Base feebly rounded, marked by four spiral 



