200 BULLETIN 68, UNITED STATES NATIONAL MUSEUM. 



well rounded with an obscure umbilical chink. Entire surface of 

 base and spire marked by numerous, slightly retractive lines of 

 growth and exceedingly fine, closely spaced, spiral striations. Aper- 

 ture ovate; posterior angle obtuse; outer lip very thin; columella 

 slender, strongly curved, slightly revolute, provided with a weak, deep- 

 seated fold at its insertion. 



The type (Cat. no. 206913, U.S.N.M.) and twenty-one specimens 

 were dredged at U. S. Bureau of Fisheries station 2902, in 53 fathoms, 

 temperature 45°, off Santa Rosa Island, California. 



The type has five post-nuclear whorls and measures: Length 2.9 

 mm., diameter 1.4 mm. Fifteen additional specimens (Cat. no. 

 206914, U.S.N.M.) were dredged at U. S. Bureau of Fisheries station 

 2901, in 48 fathoms, temperature 55°. 1, also off Santa Rosa Island. 



ODOSTOMIA (EVALEA) SEPTENTRIONALIS, new species. 



Plate 2(), iit;. <». 



Shell very elongate, ovate, thin, umbilicated, soiled yellowish white. 

 Nuclear whorls small, smooth, very obliquely, deeply immersed in 

 the first of the succeeding turns. Post-nuclear whorls inflated, well 

 rounded, summits appressed, marked by fine, retractive lines of 

 growth and numerous fine, wavy, spiral striations between the sutures 

 and on the base. The posterior half of the base has, in addition to 

 the a])ove marking, three broad, low, feeble, raised, spiral threads. 

 Umbilicus very narrow. Aperture large, very regularly oval ; pos- 

 terior angle obtuse, the thin outer lip bending strongly outward in a 

 broad swee])ing curve; columella long, slender, regularly curved and 

 moderately reflected, not reenforced l)y the l)ase, provided with a 

 feeble o])li((ue fold at its insertion; parietal wall glazed with a thin 

 callus. 



The type. Cat. no. 159462, U.S.N.M., and two additional specimens, 

 were collected by Doctor Dall, at Unalaska, Alaska. It has five post- 

 nuclear whorls, and measures: Tjcngth 4.3 mm., diameter 2.7 mm. 



ODOSTOMIA (EVALEA) CAPITANA, new species. 

 Plate 26, fig. 7. 



Shell elongate oval, unbilicated, light yellow. Nuclear whorls 

 small, deeply, very obliquely immersed in the first of the succeeding 

 turns. Post-nuclear whorls well rounded, with strongly rounded 

 summits. Entire surface marked by fine lines of growth and exceed- 

 ingly numerous, very fine, wavy, spiral striations. In addition to 

 these markings the whorls are covered by eight very slender, sub- 

 equally spaced, obsolete threads between the sutures and four which 

 are considerably stronger and equally spaced on the base. Periphery 

 and base of the last whorl well rounded, the latter narrowly umbili- 

 cated. Aperture rather large, broadly ovate, posterior angle acute; 



