﻿DALL] SHELLS COLLECTED IN THE BAHAMAS 439 



Cerion (Strophiops) inconspicuam new species. PI. i.viii. figs. 2. 4. 



Shell small, white or pale brownish, bluntly spindle-shaped, with 

 about two smooth nuclear and six or seven subsequent whorls; apex 

 arcuately tapering; last whorl moderately attenuated, and. at its 

 termination, ascending a little above the middle of the whorl; um- 

 bilicus showing a small open chink; peristome simple, slightly thick- 

 ened and reflected; the ribs are narrow, small, low and separated by 

 about equal interspaces, slightly oblique and very regular; there is 

 no spiral sculpture. The nuclear shell has two short parietal, and 

 one similar basal denticle; the adult has the single parietal denticle 

 short, feeble, and pustular, the axial lamina almost obsolete. 



A variety lacunorum, is larger, heavier, and with the parietal and 

 axial laminae well developed. The measurements are of extremes: 



Height of , ^ ax 



Shell Aperture. Diameter. 



Type I/O 5 5 6.5-8.0 mm. 



Varietv 20.0 6.5 



17-5 5-/ 



80 



Watling Island. I". S. Fish Commission : the variety on the sh< r - 

 of the lagoon by Dr. J. J. Brown: U. S. Nat. Mus., No. 127.494. 

 The types Xo. 37.676. 

 Cerion {Strophiops) canonicum new species. PI. lviii. fig. 13. 



Shell stout, solid, whitish or pale brown, sub-cylindric. short, 

 stronglv sparsely ribbed and spirally striated. Nucleus prominent. 

 of two' and a half whorls, at first smooth then finely transversely 

 striated: subsequent whorls six or seven, with a tendency to con- 

 striction a little in front of the suture : the penultimate whorl has 

 about 20 nearly vertical ribs, the interspaces wider and more or less 

 distinctly spirally striated: last whorl rising to the upper third of 

 the whorl at the aperture which is large, with a thin callus on the 

 bodv and a simple broadly reflected peristome ; the umbilicus closed 

 or nearly so ; parietal lamina strong, long, extending three quarters 

 of a whorl, axial lamina feeble. Extremes of measurement: 



Height of . , r ^ ,ax 



Shell. Aperture. Diameter 



30.0 no 12.0 mm. 



27.O 9-0 130 



Gun Cay, Wild Duck expedition. This species was erroneously 

 identified as C. pannosum Maynard, which is devoid of spiral sculp- 

 ture, and comes from south of Cuba. All but one of the specimens 

 obtained were subfossil. U. S. Nat. Mus.. No. 127.460. 



