668 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 52. 



of the succeeding turns. Postnuclear whorls slightly rounded and 

 appressed at the summit, the summit of the last one dropping some 

 little distance below the pieriphery of the preceding whorl gives to 

 the penultimate whorl an overhanging aspect. Suture moderately 

 impressed. Periphery of the last whorl slightly inflated. Base mod- 

 erately long, strongly rounded, with a narrow umbilical chink. Ap- 

 erture oval; outer lip thin; inner lip slightly curved, strongly re- 

 flected, and provided with a very strong, oblique fold a little ante- 

 rior to its insertion; parietal wall covered with a moderately thin 

 callus. 



The type. Cat. No. 274006, U.S.N.M., was dredged by C. R. 

 Orcutt near the foot of Broadway in San Diego Bay, California. It 

 has four and one-fifth postnuclear whorls and measures — length, 1.5 

 mm. ; diameter, 0.8 mm. 



The minute size and pupoid shape distinguish the shell at once 

 from any of the Western American Odostomias. 



CERITHIOPSIS (CERIXmOPSIS) CHARLOTTENSIS, new epecies. 



Plate 46, figs. 9, 11. 



Shell elongate conic, pale brown. Nuclear whorls strongly rounded, 

 three, forming a slender very elevated spire, smooth. Postnuclear 

 whorls w^ell rounded, appressed at the summit, marked by rather 

 strong, almost vertical axial ribs of which 14 occur upon the first 

 four turns, 16 upon the fifth, 18 upon the sixth, and 20 upon 

 the penultimate whorl. Intercostal spaces a little wider than the 

 ribs. The spiral sculpture consists of three strong cords, of which 

 the one at the summit is a little less strong than the other two. The 

 junction of the spiral cords and the axial ribs form strong tubercles, 

 those on the cord at the summit are well rounded, while those of the 

 median cord are truncated anteriorly and posteriorly. The tubercles 

 of the third cord are truncated posteriorly and sloped gently ante- 

 riorly. The spaces inclosed between the spiral cords and the axial 

 ribs are well-rounded pits. Suture moderately constricted. Periph- 

 ery of the last whorl marked by a spiral groove, which equals in 

 strength and width the groove that separates the median from the 

 third cord on the spire. Base short, well rounded, smooth, excepting 

 the exceedingly fine incremental lines and microscopic spiral stria- 

 tions which are also present on the spire and a very slender basal 

 fasciole which surrounds the insertion of the inner lip. Aperture 

 decidedly channeled anteriorly; posterior angle obtuse; outer lip 

 thin, showing the external sculpture within, decidedly sinuous at 

 the edge; inner lip rendered decidedly flexuose; p>arietal wall cov- 

 ered by a thin callus. 



