354 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 41. 



The sloping shoulder extends from the summit to the first spiral 

 lamella. Suture strongly channeled. Periphery of the last whorl 

 marked by a spiral cord, to which the axial ribs extend. Base mod- 

 erately produced, well rounded, marked b}' three strong, sublamellar, 

 subequal, spiral cords which divide the base into four equal parts. 

 These cords are about one-fourth as wide as the concave spaces that 

 separate them, which are marked by fine incremental lines only. 

 Aperture broadly, regularly oval, slightly effuse anteriorly; posterior 

 angle obtuse; outer lip tliin at the edge, thicker within; inner lip 

 strongly curved and reflected over, and appresscd to the base; pari- 

 etal wall covered with a thick callus, rendering the peritreme 

 complete. 



The specimen described and figured (Cat. No. 152193, U.S.N.M.) 

 is a little more perfect than Doctor Dall's cotypes. It has almost 

 4 post-nuclear whorls and measures: Length 2.6 mm., diameter 



1.4 mm. 



Specimens examined. 



Catalogue No. 



Locality. 



Numbpr 

 of speci- 

 mens. 



56416 (cotypes) 

 46173 



152193 (figured). 



129003 



134856 



105468 



213695 



162665 



Monterey, California 



Do 



San Pedro, California 



San Pedro and San Diego, California 



San Diego, California (on kelp root) 



San Diego, California 



United States Bureau of Fisheries station 2932, Los Coronados Island 



California (20 fathoms, 58°, gray sand and broken shell). 

 San Martin Island , Lower California 



ALVANIA HALIA, new species. 

 Plate 31, fig. 5. 



Shell elongate-conic, white. Nuclear whorls one and one-half, well 

 rounded apparently with several spiral lirations, which are ill-defined 

 on the somewhat eroded surface of our shells. Post-nuclear whorls 

 shouldered at the summit, ornamented by strong, axial ribs, of which 

 14 occur upon the second, 16 upon the third, and 20 upon the penul- 

 timate turn. These ribs extend strongly from the summit of the 

 whorls to the suture. In addition to the axial ribs, the whorls are 

 marked by three spiral cords which are about half as wide as the 

 spaces that separate them. The first of these cords is at the angle of 

 the shoulder near the summit, the second on the middle of the whorl, 

 while the third is immediately above the deeply channeled suture. 

 The intersections of the axial ribs and spiral cords form strong tuber- 

 cles, while the spaces inclosed between them are deeply impressed, 

 squarish pits. Periphery of the last whorl marked by a sulcus which 

 is almost as wide as that separating the supraperipheral from the 

 median cord and, like it, is crossed by the continuations of the axial 



