666 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.52. 



Francisco Bay, on sticky, nearly black, mud in 4| fathoms. Cat. 

 No. 214432, U.S.N.M., contains four additional specimens, also from 

 San Francisco Bay, dredged at U. S. Bureau of Fisheries Station 

 5781, on coarse sand, pebbly and shell bottom, in 9| to 16 fathoms. 



ODOSTOMIA (EVALEA) WILLETTI. new species. 

 Plate 43, fig. 6. 



Shell large, elongate conic, bluish white. Nuclear whorls ob- 

 liquely immersed in the first of the succeeding turns, above which 

 the tilted edge of the last volution only projects. Postnuclear whorls 

 moderately rounded, appressed at the summit, the early ones marked 

 by a moderate number of strongly incised lines, while on the later 

 whorls the incised spiral lines are finer and much more numerous, in 

 addition to the spiral sculpture the whorls are marked by decidedly 

 retractively slanting, incremental lines. Suture moderately con- 

 stricted. Periphery of the last whorl inflated, feebly angulated. 

 Base attenuated, moderately rounded. Aperture oval, somewhat 

 effuse anteriorly; posterior angle acute; outer lip thin; inner lip 

 very oblique, stout, slightly curved, reflected over and appressed to 

 the base, provided with a strong oblique fold at its insertion ; parietal 

 wall covered with a thick callus. 



The type. Cat. No. 274007, U.S.N.M., was dredged by Mr. G. 

 Willett, at Waterfall Cannery, west side of Prince of Wales Island, 

 Alaska. It has almost seven postnuclear whorls and measures — 

 length, 5.8 mm. ; diameter, 2.4 mm. Another specimen from the same 

 locality is in Mr. Willett's collection. 



ODOSTOMIA (EVALEA) PLEIOREGONA, new species. 



Plate 42, fig. 5 ; plate 45, fig. 6. 



Shell broadly conic, white. Nuclear whorls deeply immersed in the 

 first of the succeeding turns, above which the tilted edge of the last 

 volution only projects. Postnuclear whorls flattened, appressed at 

 the summit, all of them marked by very fine, closely spaced, spiral 

 striations and decidedly retractively slanting, fine incremental lines. 

 Suture moderately impressed. Periphery of the last whorl inflated, 

 obtusely angulated. Base short, well rounded. Aperture large, 

 slightly effused anteriorly; posterior angle acute; outer lip thin; 

 inner lip oblique, slightly revolute, and appressed to the base for its 

 posterior half and provided with a strong, oblique fold at its inser- 

 tion ; parietal wall covered with a thick callus. 



The two cotypes. Cat. No. 252430, U.S.N.M., were collected by 

 Harold Hannibal in the upper Pliocene, Elk River beds, at the mouth 

 of Elk River, near Port Orford, Oregon. One of these is a young 



