226 BULLETIN 68, UNITED STATES NATIONAL MUSEUM. 



ODOSTOMIA (AMAURA) PESA, new species. 



Plate 29, fig. 2. 



Shell elongate-ovate, very coarse and heavy. Nuclear whorls 

 small, deeply, obliquely immersed in the first of the succeeding turns. 

 Post-nuclear whorls rather high between the sutures, well rounded 

 with narrowly tabulate summits, marked by somewhat retractive 

 lines of growth and numerous, closely placed, wavy spiral striations. 

 Sutures well marked. Periphery of the last whorl well rounded, 

 marked like the spire. Base slightly prolonged, well rounded. Aper- 

 ture ovate, somewhat effuse anteriorly; posterior angle acute; outer 

 lip very heavy; columella strong, flexuose with a strong, broad fold 

 somewhat anterior to its insertion; parietal wall covered by a thin 

 callus. 



The type (Cat. no. 157458, U.S.N.M.) was collected by Doctor Dall 

 at Kadiak Island, Alaska. It has six post-nuclear whorls, and meas- 

 ures: Length 9.3 mm., diameter 4.4 mm. 



ODOSTOMIA (AMAURA) NOT A, new species. 

 Plate 28, fig. 6. 



Shell very elongate-ovate, light yellow. Nuclear whorls deeply 

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

 only the tilted edge of the last volution projects. Post-nuclear 

 whorls moderately rounded, slightly contracted at the sutures, 

 narrowly tabulately shouldered at the summits, marked by numerous 

 closely spaced, wavy spiral striations. Periphery and base of the 

 last whorl somewhat inflated, well rounded, marked like the spire. 

 Aperture ovate, posterior angle obtuse; outer lip thin; columella 

 short, strongly curved, reflected and provided with a moderately 

 strong fold a little anterior to its insertion. 



The type (Cat. no. 46490, U.S.N.M.) and sixteen specimens comes 

 from San Diego, California. The type has seven post-nuclear 

 whorls and measures: Length 7.5 mm., diameter 3.5 mm. 



a University of California station. 



