NO. 1574. WEST AMERICAN PYRA MIDELLID.E—DA LL AND BARTSCH. 521 



ODOSTOMIA (MENESTHO) HARFORDENSIS, new species. 

 Plate XLVI, tig. 5. 



Shell elono^ate-ovate, bluish- white. Nuclear whorls smooth, obliquely 

 immersed in the first of the succeeding tuins, only two-thirds of the 

 last volution projects above them. Post-nuclear whorls well rounded, 

 and somewhat inflated, marked by numerous incremental lines and 5 

 equally strong-, Imt irregularly distributed, punctate, incised, spiral 

 lines between the sutures. The two near the summit are placed closer 

 to tnich other than any of the others, the space between the summits 

 and the second line bemg about equal to the space inclosed between 

 the Hrst and second supra-peripheral lines. The third line falls on 

 about the middle of the exposed portion of the whorls and is a little 

 neaier to the second line than the one anterior to it. In addition to 

 these 5 strongly incised lines there are numerous very tine and closel}^ 

 spaced spiral strisv which cross all parts of the surface of the shell. 

 Pei'iphery and base of the last turn inflated, the latter marked by lines 

 of growth and 8 strongly incised, punctate spiral lines, which are a 

 little less strongly impressed and a little more closely spaced at the 

 umbilical area than at the peripheral part of the base. These lines 

 equal those of the spire in strength. Sutures constricted. Aperture 

 veiy large, somewhat efluse anteriorly; posterior angle acute; outer 

 lip thin, showing the external sculpture within; columella curved, reen- 

 forced by the attenuated base and provided with a strong fold and its 

 insertion; parietal wall covered by a thin callus. 



The type (Cat. No. 196299, U.S.N.M.) was collected by Mrs. Merri- 

 hew, at Port Harford, California. It has 5 post-nuclear whorls and 

 measures: Length 3.2 mm., diameter 1.8 mm. 



ODOSTOMIA (MENESTHO) EXARA, new species. 

 Plate XLVI, fig. 6. 



Shell elongate - ovate, subdiaphanous. Nuclear whorls smooth, 

 deeply inuiiersed in the first of the succeeding turns, only a part of 

 the last one appearing above it. Post-nuclear whorls somewhat 

 inflated, well rounded, marked on the first whorl by 8, on the second 

 by 12, on the third by 14, and on the penultimate between the sutures 

 by 20 subequal and equally spaced, low, depressed spiral cords which 

 are separated by narrower channels. Periphery and base of the last 

 whorl inflated, sculptured like the spire by probably 20 spiral cords. 

 In addition to the spiral sculpture the entire surface is marked by fine 

 incremental lines which are best marked in the spaces between the 

 cords. Aperture oval, somewhat effuse anteriorly; posterior angle 

 acute; outer lip thin, showing the external sculpture within; columella 



