NO. 1790. WEST AMERICAN ALABINA—BART8CH. 411 



rounded keel. The shoulder is smooth, excepting fine lines of growth; 

 the portion between the suture and the shoulder is well rounded, 

 marked with lines of growth and 9 to 11 equal and equally spaced 

 incised spiral lines. Sutures strongly constricted; periphery of the 

 last whorl well rounded. Base moderately long, somewhat inflated, 

 well rounded, narrowly umbilicated, marked by slender lines of 

 growth and nimierous fine spiral striations. Aperture very broadly 

 ovate; posterior angle obtuse; outer lip thin, columella slender, 

 slightly oblique, revolute. 



The specimen described and figured (Cat. no. 127551, U.S.N.M.) 

 is one of six which come from the Mud Flats, near San Diego, Cali- 

 fornia. It has 9 whorls and measures: Length 3.1 mm., diameter 

 1 mm. 



ALABINA BARBARENSIS, new species. 



Plate 61, fig. 3. 



Shell broadly conic, creamy yellow. (Nuclear whorls decollated.) 

 Post-nuclear whorls flattened, appressed at the summit, marked by 

 four slender, incised, spiral lines, which divide the space between the 

 sutures into five equal, flat, cords; axial sculpture consisting of lines 

 of growth only. Sutures strongly impressed. Periphery of the last 

 whorl angulated. Base well rounded, marked by six spiral lines, 

 which divide it into six cords, the posterior five of which are equal, 

 the one about the umbilicus being wider than the rest. Aperture 

 ovate, feebly channeled anteriorly. Posterior angle acute; outer lip 

 thin at the edge; columella decidedly curved, oblique, strongly 

 reflected over the reinforcing base; parietal wall covered with a thick 

 callus. 



The type (Cat. no. 203676, U.S.N.M.) and four specimens come from 

 the Postpliocene of Santa Barbara, California. The type has 8 whorls 

 and measures: Length 6.2 mm., diameter 2.8 mm. 



ALABINA HAMLINI, new species. 



Plate 61, fis. 2. 



Shell elongate-conic, yelloAvish white. Greater part of the nuclear 

 whorls decollated, the last turn only remaining, which is well rounded 

 and smooth. The first two post-nuclear turns are strongly, slop- 

 ingly shouldered, the remainder well rounded. All of them are 

 marked between the sutures by four nodulose spiral cords, of which 

 the third one below the summit is the largest, while the two posterior 

 to it are of equal size, but smaller than the rest. The shoulder on the 

 first two whorls extends from the third cord to the summit. In 

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

 which 14 occur upon the first and second, 16 upon the third, while 

 upon the last they become somewhat irregular. The spaces inclosed 



