198 nCLLETIN 68, UNITED STATES NATIONAL MUSEUM. 



many equal closely and equally spaced spiral striations. Aperture 

 oval; posterior angle obtuse; outer lip thin; columella thin, curved, 

 with a slender fold opposite the umbilicus; parietal wall covered with 

 a thin callus, which renders the peritreme complete. 



Two specimens of this species were obtained off Spondijlus, at 

 Mazatlan, Mexico. Tablet 1958, Liverpool collection, British 

 ISIuseum, contains the largest, which has five post-nuclear whorls, 

 and measures: Length, 1.6 mm.: diameter, 0.7 mm. 



ODOSTOMIA fEVALEA) VALDEZI Dall and Bartsch. 



Plate 23, fig. (i. 



Odostomia(Evalea)valdeziT> ALL and Bartsch, Proc U.S. Nat. Mas., vol. .3:^, 1907, 

 p. 526, pi. 48, fig. 2. 



Shell small, thin, very elongate-oval, subdiaphanous to milk-white, 

 having the entire surface marked by rather strong lines of growth 

 and numerous microscopic spiral striations. Nuckar whorls deeply 

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

 only the tilted edge of the last turn is visible. Post-nuclear turns 

 rather high between the sutures, well rounded, with, narrowly roundly 

 shouldered summits. Periphery and base of the last turn inflated and 

 well rounded, the latter with a very narrow umbilical chink. Aper- 

 ture moderately large, oval; posterior angle acute; columella strongly 

 curved, reinforced by the attenuated base and provided with a moder- 

 ately strong fold opposite the umbilical chink. 



The type has five post-nuclear whorls, and measures: Length 3 

 mm., diameter 1.3 mm. It and another specimen (Cat. no. 196249, 

 U.S.N.M.) were collected by Mr. S. S. Berry, in 12 fathoms, off Del 

 Monte, Monterey, California. Two additional specimens from the 

 same station are in Mr. Berry's collection. 



ODOSTOMIA (EVALEA) NEMO, new species. 



Plate 22, fig. 8. 



Shell elongate-conic, milk-white. 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 flat- 

 tened in the middle, moderateh^ contracted at the suture, and 

 roundly shouldered at the .summit. Suture strongl}^ impressed. 

 Periphery and base of the last whorl somewhat inflated, well rounded, 

 the latter very frequently narrowly um])ilicated. Entire surface of 

 spire and base marked by vertical lines of growth and numerous 

 exceedingly fuie, spiral striations. Aperture ovate, somewhat effuse 

 anteriorly; posterior angle acute; outer lip thin; columella thin, 

 curved, strongly reflected, provided with a fold at its insertion; 

 parietal wall glazed with a thin callus. 



