bartsch: northwest coast mollusks 571 



the base and appressed to it except at the extreme tip, which alone is 

 free; a strong fold is present on the inner lip a little anterior to its 

 insertion; parietal wall covered by a thin callus. 



The type and three additional specimens, Cat. No. 334492, U. S. N. 

 M., were collected by Dr. Engberg ofif vSan Juan Island, Gulf of Georgia. 

 The type has a little more than 5 whorls and measures: altitude, 7 

 mm.; diameter, 3.4 mm. Eight additional specimens from the same 

 station are in Dr. Engberg's collection. 



Odostomia (Amaura) sanjuanensis, sp. nov. 



Shell elongate ovate, wax yellow. Nuclear whorls decollated. Post- 

 nuclear whorls narrowly tabulatedly shouldered, moderately rounded, 

 marked by regular retractively slanting lines of growth and fine spiral 

 striations, which give to the surface a cloth-like texture when subjected 

 to high magnification. In addition to this sculpture, the surface of the 

 shell is marked by strong incremental lines and more or less irregular 

 and irregularly distributed spiral threads, which produce a malleated 

 pattern. Suture strongly marked. Periphery of the last whorl well 

 rounded. Base moderately long, well rounded, marked like the spire. 

 Aperture obliquely ovate; posterior angle obtuse; outer lip thin; inner 

 lip very obliquely retractively slanting, somewhat flexuose and pro- 

 vided with a strong fold at its insertion ; parietal wall covered by a thin 

 callus. 



The type. Cat. No. 334491, U. S. N. M., was collected by Dr. C. C. 

 Engberg near San Juan Island, Gulf of Georgia. It has 5V 2 whorls 

 and measures: altitude, 7.2 mm.; diameter, 3.5 mm. Another specimen 

 from the same locality is in Dr. Engberg's collection. 



Odostomia (Amaura) washingtonia, sp. nov. 



Shell moderately large, broadly elongate conic, pale horn colored. 

 Nuclear whorls too eroded to permit of description. Postnuclear 

 whorls strongly tabulatedly shouldered at the summit, moderately 

 rounded, marked by decidedly retractively slanting lines of growth and 

 numerous very finely incised spiral striations. vSutures conspicuously 

 marked by the tabulated summit. Periphery of the last whorl inflated, 

 strongly rounded. Base short, inflated and strongly rounded, marked 

 like the spire. Aperture rather large, almost subquadrate, slightly 

 oblique; posterior angle obtuse; outer lip thin; inner lip flexuose, re- 

 flected over the base, but not appressed, the axis being decidedly pro- 

 tractively slanting. A strong columellar fold is present at the um- 

 bilical chink. Parietal wall covered by a thick callus. 



The type. Cat. No. 334490, U. S. N. M., was collected by Dr. C. C. 

 Engberg at San Juan Island, Gulf of Georgia. It has 7 whorls and 

 measures: altitude, 8.7 mm.; greater diameter, 4.2 mm. The decidedly 

 turreted outline of this shell, together with its broadly conic shape, will 

 distinguish it at once from any of the other West Coast Amauras. 



