Art. 11 NEW AMERICAN MARINE MOLL.USKS BARTSCH 21 



dered at the summit, rather high between the angle at the summit 

 and the suture, marked by rather coarse incremental lines which fre- 

 quently show heavy erosion marks; in fact, the early whorls are 

 badly eroded. In addition to this, the whorls are marked by fine 

 spiral striations. Suture rendered conspicuous by the tabulated 

 shoulder. Periphery strongly rounded. Base moderately long, some- 

 what inflated, strongly rounded, marked by the lines of growth and 

 the fine spiral sculpture characteristic of the spire. There is a slight 

 umbilical chink but not a perforation. Aperture rather large, oval, 

 posterior angle obtuse; outer lip thin; columella oblique, slightly 

 expanded and reflected, and provided with a strong oblique fold at 

 its insertion; parietal wall covered with a thin callus. 



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

 Engberg off San Juan Island, Gulf of Georgia, Washington. It has 

 6.2 postnuclear whorls, the nucleus being lost, and measures, length 

 8.6 mm. ; diameter, 4.2 mm. 



ODOSTOMIA (AMAURA) ENGBERGI Bartsch 



Plate 5, fig. 5 



Odostomia (Aniaura) engbergi Bartsch, Joiirn. Wash. Acad. Sci., vol. 10, 

 1920, No. 20, pp. 570-571. 



Shell elongate-ovate, yellow, a little paler toward the tip. Nuclear 

 whorls eroded in all the specimens seen. Postnuclear whorls nar- 

 rowly tabulatedly shouldered at the summit, quite strongly rounded, 

 marked by very fine slightly slanting lines of growth and equally 

 fine spiral striations ; the combination, when viewed under the micro- 

 scope, gives to the surface a clothlike texture. Suture stron«>;Iy 

 marked. Periphery of the last whorl inflated, strongly rounded. 

 Base strongly rounded. Aperture narrowly ovate; posterior angle 

 very obtuse; outer lip thin; inner lip short, very oblique, somewhat 

 sinuous, reflected over 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, Cat. No. 334492, U.S.N.M., was collected by Dr. C. C. 

 Engberg off San Juan Island, Gulf of Georgia. It has a little more 

 than five whorls and measures, altitude, 7 mm.; diameter, 3.4 mm. 

 Cat. No. 368783, U.S.N.M., contains three paratypes from the same 

 source. Eight additional specimens from the same station are in 

 Doctor Engberg's collection. 



