NO. 1790. WEfiT AiJERICAN ALABINA—BARTSCH. 413 



ALABINA r>IOMEDE.a;. new species. 



Plate 62, fig. 1. 



Shell elongate-conic, wax yellow. Nuclear whorls 3, small, de- 

 cidedly rounded, smooth. Post-nuclear whorls well rounded ^vith 

 a slender sloping shoulder which extends from the summit to the 

 middle of the whorls, where it is bounded by a .strong, median spiral 

 keel. There are two other keels upon the whorls between the sutures, 

 one a little less strong and a little nearer the suture than the median, 

 and another a little nearer the .summit than the median ; the latter be- 

 ing the weakest of the three. In addition to the spiral cords, the whorls 

 are marked by numerous very fine, spiral st nations and well rounded, 

 slender, curved, axial riblets, of which 24 occur upon all but the last 

 two turns, which have 26. In addition to the axial riblets there are 

 numerous fine lines of growth. The intersections of the axial ribs 

 and the spiral cords are slightly nodulose. The spaces inclo.sed 

 between them are impres.sed rectangular pits. Periphery of the last 

 whorl marked by a sulcus. Base moderately long, well rounded, 

 marked by five spiral cords which are equally .spaced, but grow 

 successively weaker from the periphery to the umbilical area. Aper- 

 ture broadly ovate, somewhat effuse anteriorly; posterior angle 

 obtuse; outer lip thin, shomng the external sculpture within; 

 columella slender, decidedly curved, very slightly revolute; parietal 

 wall glazed with a thin callus. 



The type has 8 post-nuclear whorls, and measures: Length 4.7 mm., 

 diameter 1.7 mm. It and 2,398 specimens were dredged at U. S. 

 Bureau of Fisheries station 2823 in 26^ fathoms, on broken shell 

 bottom off Cacachitas, Gulf of California. They are entered as 

 Cat. no. 96705, U.S.N.M. Cat. no. 96710, U.S.X.M., contain.s 173 

 specimens dredged at station 2822 in 21 fathoms, on coral sand and 

 broken shell bottom in the Gulf of California. Cat. no. 1.51950, 

 U.S.X.M., contains 910 specimens dredged at U. S. Bureau of Fish- 

 eries stations 2826 to 2828 in 9^ to 10 fathoms, on shell bottom, near 

 La Paz, Gulf of California. 



ALABINA IGNATI, new species. 



Plate 62, fig. 3. 



Shell elongate conic. Early whorls bright, light chestnut bro-^n, 

 later wax yellow. Nuclear whorls 3, .small, strongly rounded, smooth ; 

 post-nuclear whorls with a strong, sloping .shoulder which extends 

 from the summit to the mirifUe of the whorl ; marked by 4 spiral keels 

 of which the strongest is on the middle of the whorl, the next stronger 

 about half way between the suture and the median, and the next 

 half between the median and the summit, the fourth remaining a .slen- 



