WEST AMERICAN PYRAMIDELLID MOLLUSKS. 211 



surface shows fine incremental lines. Aperture elongate-oval, eflfuse 

 at the junction of the outer lip and the columella; posterior angle 

 obtuse; outer lip thin; columella stout, curved, and decidedly re- 

 flected over the reenforced base, provided with a strong oblique fold 

 opposite the obsolete umbilical chink; parietal wall covered with a 

 thin callus. 



The type (Cat. no. 204010, U.S.N.M.) has six post-nuclear whorls 

 and measures: Length 5.3 mm., diameter 2.6 mm. It and eight 

 additional specimens were collected by Mrs. Kate Stephens at Bear 

 Bay, Peril Straits, Baranoff Island, Alaska. Two in addition to the 

 type were listed under the same number as the type in the U. S. 

 National ]\[useum. The rest are in Mrs. Stephens's collection. 



Named for ]Mrs. Kate wStephens. 



ODOSTOMIA (EVALEA) CLESSINI, new species. 

 Plate 24, fig. 4. 



vShell elongate-ovate, rather thick, yellowish-white. Nuclear whorls 

 small, very obliquely immersed in the first of the succeeding turns, 

 above which the edge of only about two-thirds of the last nuclear 

 whorl project. Post-nuclear turns very high between the sutures, 

 moderately rounded, marked by lines of growth and fine, irregular 

 and irregularly distributed incised spiral lines. Suture well im- 

 pressed. Periphery and base of the last whorl well rounded, marked 

 like the spaces l^etween the sutures. Aperture pear-shaped, posterior 

 angle acute; outer lip rather thick within, thin at the edge; columella 

 short, stout, curved, reflected, reenforced by the base and provided 

 with a strong oblique fold at its insertion; parietal wall covered by a 

 thin callus. 



The type (Cat. no. 204014, U.S.N.M.) has lost the nucleus and 

 probably the first post-nuclear whorl. The five turns remaining 

 measure: Length 6 nnn., diameter 2.9 mm. This and another speci- 

 men listed under the same number were donated by Mrs. Kate 

 Stephens, who collected them and seven others at Bear Bay, Peril 

 Straits, Baranoff Island, Alaska. Five additional specimens, two of 

 which (Cat. no. 204015, U.S.N.]\I.) were collected by her at Hawk 

 Inlet, Alaska, and one more at Mole Harbor, Alaska. Two others 

 (Cat. no. 159461, I^S.N.M.) were collected by Doctor Dall at Sitka, 

 Alaska. 



Named for T. Clessin. 



ODOSTOMIA (EVALEA) MINUTISSIMA, new species, 

 riate 25, fig. 4. 



Shell very small, very regularly narrowly conic, bluish-white. 

 Nuclear whorls deeply obliquely immersed in the first of the succeed- 

 ing turns, above which only the tilted edge of the last volution pro- 

 jects. Post-nuclear whorls slightly rounded, feebly contracted at the 



