NO. 1790. WEST AMERICAN ALABINA—BARTSCH. 415 



ALABINA lO, new species. 

 Plate 61, fig. 1. 



Shell conic, white. Nuclear whorls small, well rounded. Post- 

 nuclear whorls well rounded, appressed at the summit, marked by 

 rather broad, low, obsolete, retractive ribs, of which 18 occur upon 

 the fourth and fifth, and 20 upon the penultimate turn. Sutures 

 strongly constricted. Periphery of the last whorl well rounded. 

 Base moderately long, well rounded. Aperture oval; posterior angle 

 obtuse; outer lip thin; columella short, slightly revolute, and rein- 

 forced by the base. 



The type (Cat. no. 148669, U.S.N.M.) comes from the Post PHocene 

 beds of San Diego, California. It has 7 post-nuclear whorls and 

 measures: Length 6 mm., diameter 2.3 mm. 



ALABINA MONICENSIS, new species. 

 Plate 62, fig. 5. 



Shell small, white. Nuclear whorls partly decollated, those 

 remaining, well rounded, without apparent sculpture. Post-nuclear 

 whorls well rounded, appressed at the summit, separated by con- 

 stricted sutures, marked by numerous raised axial threads and 7 

 subequally spaced, low broad spiral cords between the sutures. 

 Periphery of the last whorl well rounded. Base moderately long, 

 well rounded, marked like the spire. Aperture broadly ovate; outer 

 lip thin; columella slender, decidedly curved, reflected slightly over 

 the base; parietal wall glazed with a thin callus. 



The type (Cat. no. 195217, U.S.N.M.) has 8 whorls remaining and 

 measures: Length 5 mm., diameter 1.7 mm. It comes from the 

 Upper San Pedro Series at Santa Monica, California. 



ALABINA TENUISCULPTA Carpenter. 



Plate 61, fig. 6. 



Mesalia tenuisculpta Carpenter, Rep. Brit. Ass. Adv. Sci. for 1863, 1864, pp. 

 612 and 655. — ?MesaIia tenuisadpta Carpenter, Proc. Cal. Acad. Nat. 

 Sci., vol. 3, 1866, p. 216. 



Shell acicular, light chestnut brown. Nuclear whorls very small, 

 2h, increasing regularly in size, well rounded. Post-nuclear whorls 

 with a strong, very wide, sloping shoulder which extends over the 

 posterior half of the whorls between the sutures; and is bounded 

 at the summit by a slender spiral thread. The first five post- 

 nuclear turns have a strong, median, spiral cord and a second as 

 strong as the median, about halfway between the suture and the 

 median cord. Midway between these two, a slender spiral thread 

 can be seen on the third to the sixth whorl. On the last three 



