WEST AMERICAN PYRAMIDELLTD M0LLU8KS. 209 



giving the spire a decidedly truncated effect. Post-nuclear whorls 

 moderately rounded, feebly contracted at the suture, appressed at 

 the summit, through which the preceding whorl shines, which gives 

 the summit the effect of having a double suture. Suture moderately 

 impressed. Periphery of the last whorl inflated, weakly angulated. 

 Base short, sloping in a gentle curve from the periphery to the umbil- 

 ical area. Entire surface of spire and base marked by decidedly 

 retractive lines of growth and numerous well-incised spiral striations. 

 Aperture large, ovate; posterior angle acute; outer lip thin; columella 

 strongly curved, slightly reflected, reenforced by the narrow base, and 

 provided wdth a strong deep-seated fold at its insertion. 



The type (Cat. no. 206916, U.S.N.M.) comes from Ocean Beach, 

 California. It has six post-nuclear whorls and measures: Length 

 3 mm., diameter 1.5 mm. Another specimen (Cat. no. 153056, 

 U.S.N.M.) comes from the government jetty at San Diego, California. 



ODOSTOMIA (E VALE A) SERILLA, new species. 

 Plate 24, fig. 9. 



Shell elongate-conic, white. Nuclear whorls deeply obliquely 

 immersed in the first of the succeeding turns, above wdiich only the 

 titled edge of the last volution projects. Post-nuclear whorls well 

 rounded, rather high between the sutures, contracted at the peripher}", 

 strongly, narrowdy tabulately shouldered at the summit. Suture 

 strongl}^ marked. Periphery of the last whorl and the rather long 

 base well rounded. Entire surface of spire and base marked })y 

 numerous lines of growth and w-ell-incised spiral striations. Aperture 

 ovate, posterior angle acute; outer lip thin; columella strongly 

 curved, slightly revolute, provided wdth a fold at its insertion. 



The type ((iat. no. 206917, U.S.N.M.) comes from University of 

 California station 59, off San Diego. It has six post-nuclear whorls 

 and measures: Length 4.8 mm., diameter 2 mm. 



ODOSTOMIA (EVALEA) TACOMAENSIS Dall and Bartsch. 



Plate 24, fig. 8. 



Odostomia (Evalea) tacomaensis Dall and Bartsch, Proc. U. S. Nat. Mus., vol. 33, 

 1907, p. 526, pi. 47, fig. 10. 



Shell ovate, yellowish. Nuclear whorls small, deeply immersed in 

 the first of the succeeding turns. Post-nuclear whorls well rounded, 

 faintly roundly shouldered at the extreme summits. Periphery of the 

 last whorl rounded. Base inflated, well rounded, somewhat attenuated 

 anteriorly. Surface covered by numerous equal and equall}^ closely 

 spaced slender wavy spiral striations, of which there are about forty 

 between the summit and the periphery of the last whorl. Base marked 

 like the space posterior to it. In addition to the spiral sculpture the 

 entire surface of the shell is crossed by numerous fine lines of growth, 



