340 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.41. 



continuations of the axial ribs. Base moderately produced, slightly 

 concave in the middle, marked by six equal and almost equally 

 spaced spiral cords and the continuations of the axial ribs. Aperture 

 oblique, moderately large, oval; posterior angle acute; outer lip very 

 thick, reenforced immediately behind the edge by a strong varix, 

 showing about 10 internal lirations within the aperture; inner lip 

 very stout, curved, and reflected over and appressed to base ; parietal 

 wall covered with a thick callus which completes the peristome. 



The type (Cat. No. 213684, U.S.N.M.) has 5 post-nuclear whorls 

 and measures: Length 3.3 mm., diameter 1.9 mm. It comes from 

 Monterey, California. 



ALVANIA CALIFORNICA, new species. 

 Plate 29, fig. 9. 



Shell elongate-ovate, the spire posterior to the periphery of the 

 last whorl forming a perfect cone, yellowish white. Nuclear whorls 

 two and one-half, well rounded, smooth, separated by a moderately 

 constricted suture. Post-nuclear whorls moderately well rounded, 

 marked by slender, rounded, slightly protractive, axial ribs, of which 

 26 occur upon the first and 34 upon the second and the penultimate 

 turn. These axial ribs extend quite prominently from the summit of 

 the whorls, where they form slender cusps, to the periphery of the 

 whorls, becoming evanescent immediately anterior to the periphery. 

 In addition to the axial ribs, the whorls are marked by spiral cords 

 about as strong as the axial ribs. Of these two occur upon the first 

 volution, where they divide the space between the sutures into three 

 equal parts; on the second there are four, while upon the penulti- 

 mate turn there are six. Suture strongly channeled. Periphery of 

 the last whorl marked by a sulcus as wide as the one which separates 

 the two cords posterior to it. Base moderately long, well rounded, 

 marked by six almost equally spaced, spiral cords, which grow suc- 

 cessively stronger from the periphery to the umbilical area. In 

 addition to these spiral cords, there are feeble extensions of the axial 

 ribs occurring in the space between the first and second sulcus ante- 

 rior to the periphery. Apertiu^e very broadly oval; posterior angle 

 obtuse; outer lip very thick, reenforced immediately behind the edge 

 by a strong varix, showing about 10 lirations within; inner lip stout, 

 curved, strongly reflected over and appressed to the base; parietal 

 wall covered with a thick callus, which completes the peristome. 



The type and 10 other specimens (Cat. No. 56347, U.S.N.M.) come 

 from Monterey, California. The type has 3^ post-nuclear whorls and 

 measures: Length 2.5 mm., diameter 1.4 mm. 



