WEST AMERICAN PYRAMIDELLID MOLLUSKS. 217 



whorls moderately rounded, very weakly roundly shouldered at the 

 summit, separated by a strongly marked suture; a narrow band 

 appears about the summit showing its junction with the preceding 

 turn. Periphery and base of the last whorl inflated and well rounded. 

 Entire surface of base and spire marked by very fine lines of growth 

 and numerous microscopic wavy spiral striations. Aperture rather 

 large, somewhat effuse anteriorly; posterior angle acute; outer lip 

 thin; columella rather stout, strongly curved, and revolute, reen- 

 forced by the attenuated base, and covered with a strong fold at its 

 insertion. This fold can be seen through the transparent shell as a 

 quite sti'ong lamella on the pillar of the turns. 



The type (Cat. no. 46492, U.S.N.M.) is from Monterey, has 6i 

 post-nuclear whorls and measures: Length 4 mm., diameter 1.9 mm. 

 Another specimen (Cat. no. 196301, U.S.N.M.) also comes from Mon- 

 terey, California. 



ODOSTOMIA (EVALEA) PARELLA, new species. 



Plate 27, fig. 5. 



Shell elongate-conic, pale yellow. (Nuclear whorls decollated.) 

 Post-nuclear whorls flattened in the middle between the sutures, 

 strongly contracted at the periphery, moderately roundly shouldered 

 at the summit, marked by rather strong lines of growth and exceed- 

 ingly fine, closely spaced, microscopic spiral striations. Suture 

 strongly contracted. Periphery and base of the last whorl well 

 rounded, the latter slightly inflated, marked like the spire. Aper- 

 ture ovate; posterior angle acute; outer lip thin; columella very 

 strongly curved, somewhat revolute, reenforced by the base, provided 

 with a fold at its insertion. 



The type (Cat. no. 206926, U.S.N.M.) was dredged at U. S. Bureau 

 of Fisheries station 2808, in 634 fathoms, temperature 39.9°, near 

 the Galapagos Islands. It has the last five whorls remaining which 

 measure: Length 3.7 mm., diameter 1.6 mm. It has lost the nucleus 

 and probably the first two succeeding turns. 



ODOSTOMIA (EVALEA) GRANADENSIS, new species. 

 Plate 27, fig. 4. 



Shell very slender, ovate-conic, white, with a narrow, faint yellow 

 band a little posterior to the middle between the sutures. Nuclear 

 whorls very deeply obliquely immersed in the first of the succeeding 

 turns, above which only the tilted edge of the last volution projects. 

 Post-nuclear whorls flattened, slightly contracted at the sutures, and 

 feebly shouldered at the summits. Periphery and base of the last 

 whorl well rounded, the latter somewhat attenuated. Entire surface 

 of spire and base marked by many fine, closely spaced, wavy spiral 

 striations, which are considerably stronger on the base than between 



