412 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 39. 



between the ribs and the spiral cords appear as squarish, well- 

 impressed pits, while their intersections form low and well rounded 

 nodules. Sutures strongly impressed; periphery of the last whorl 

 marked by a shallow sulcus. Base well rounded, marked by a single 

 low feeble cord immediately below the peripheral sulcus, which is 

 almost as wide as the spiral cords between the sutures, and numerous 

 lines of growth. Aperture ovate, slightly channeled anteriorly; pos- 

 terior angle acute; outer lip thin at the edge; columella strong, decid- 

 edly curved and reflected over the reinforcing base; parietal wall 

 covered with a thin callus. 



The type and 19 specimens (Cat. no. 195216, U.S.N.M.) were col- 

 lected in the Post-Pliocene deposits at Ilallenbeck's Well, Los Angeles, 

 California. The type has 6 post-nuclear whorls, and measures : Length 

 6.8 mm., diameter 2.5 mm. 



Named for Mr. Homer Hamlin, the collector. 



ALABINA PHANEA, new species. 



Plate 62, fig. 6. 



Shell elongate-conic, white excepting the nuclear whorls which 

 are yellowish brown. Nuclear whorls small; the first one and one- 

 half well rounded and smooth; the next two marked by two strong 

 spiral keels, which divide the space between the sutures into three 

 subequal parts. Post-nuclear whorls strongly, slopingly shouldered, 

 ornamented with moderately strong, decidedly curv^ed, axial ribs, of 

 which 16 occur upon the first, 18 upon the second to fourth, 20 upon 

 the fifth, 22 upon the sixth, and 18 upon the penultimate turn. In 

 addition to these ribs, the whorls are marked by three broad, low, 

 spiral cords, the weakest of which is at the summit, while the other 

 two divide the space between the sutures into three equal portions. 

 The intersections of the axial ribs and the spiral keels form strong 

 tubercles which are truncated posteriorly and slope gently anteriorly. 

 The two middle cords are much more strongly tuberculate than the 

 one at the summit. The spaces inclosed between the axial ribs and 

 the spiral cords are moderately impressed, squarish pits. Sutures 

 strongly impressed. Periphery of the last whorl marked by a 

 channel which is crossed by the continuations of the axial ribs that ter- 

 minate at its anterior border. Base short, well rounded, ornamented 

 with four rather broad, weak spiral cords. Aperture subquadrate, 

 channeled anteriorly; posterior angle decidedly obtuse; outer lip 

 thin, showing the external sculpture within; columella decidedly 

 oblique, strongly revolute and somewhat twisted; parietal wall 

 covered with a moderately thick callus. 



The type and two specimens (Cat. no. 198924, U.S.N.M.) come 

 from San Diego, California. The type has 8 post-nuclear whorls, and 

 measures: Length 3.6 mm., diameter 1.1 mm. 



