196 BULLETIN (58, UNITED STATES NATIONAL MUSEUM. 



ODOSTOMIA (EVALEA) ESILDA, new species. 



Plate 22, fig. 1. 



Shell elongate-ovate, light yellow. Nuclear whorls decollated. 

 Post-nuclear whorls inflated, slightly rounded in the middle, more so 

 toward the suture, and the ai)pressed summit. Periphery and base of 

 the last whorl well rounded, the latter narrowly umbilicated. Entire 

 surface of spire and base marked by vertical lines of growth and 

 numerous very fine, closely spaced, spiral lirations. Aperture large, 

 oval, slightly effuse anteriorly ; posterior angle obtuse; outer lip thin; 

 columella slender, strongly reflected, almost closing the umbilicus; 

 provided with a strong, deep-seated fold at its insertion. 



The type (Cat. no. 206909, U.S.N.M.) was dredged at U. S. Bureau 

 of Fisheries station 2936, in 359 fathoms, temperature 49°, off San 

 Diego, California. It has lost the nucleus and the first post-nuclear 

 turn; the five remaining measure: Length 5.5 mm., diameter 2 mm. 



ODOSTOMIA (EVALEA) ALEUTICA, new species. 



Plate 22, fig. 5. 



Shell broadly conic, light green. Nuclear whorls small, deepty 

 obliquely immersed in the first of the succeeding turns. Post-nuclear 

 whorls somewhat inflatedly rounded, with well-rounded summits. 

 Entire surface marked by fine lines of growth and numerous ver}'^ 

 fine, closely spaced, wav^^, spiral striations. Sutures strongly 

 impressed. Periphery of the last whorl and base well rounded, the 

 latter quite strongly inflated. Aperture broadly ovate, somewhat 

 effuse anteriorly, posterior angle acute; outer lip broadly curved, 

 thin; columella slender, curved, and reflected, free from the base, 

 forming a suggestion of an umbilicus; columellar fold slender, situ- 

 ated a little below the insertion of the columella; parietal wall covered 

 by a thin callus. 



The above description is based upon two individuals which, together 

 with twelve other specimens form Cat. no. 205179, U.S.N.M., and 

 which were dredged at U. S. Bureau of Fisheries station 3336, in 

 Iliuliuk Harbor, Bering Sea, Alaska, in 55 fathoms, bottom tempera- 

 ture 41°. 6. The nucleus was described from a young individual and 

 the post-nuclear whorls from an adult specimen, which has lost the 

 nucleus and the first post-nuclear turn. The five remaining turns of 

 this measure : Length 4.4 mm., diameter 2.8 mm. Another specimen. 

 Cat. no. 159464, U.S.N.M., was collected in Captains Harbor, 

 Unalaska, Alaska, in 25 fathoms on mud bottom, by Dr. W. H. Dall. 

 Another, Cat. no. 160958, U.S.N.M., also collected by Doctor Dall, 

 comes from Amaknak Island, Unalaska, Alaska. 



