West American pyramidellid mollusks. 191 



The unique type (Cat. no. 16S660, U.S.N.^r.) was dredged at U. S. 

 Bureau of Fisheries station 3306, ofT Bristol Bay, Bering Sea, Alaska, 

 in 33 fathoms, bottom temperature 38.9. It has five post-nuclear 

 whorls and measures: Length 4.3 mm., diameter 2.2 mm. 



ODOSTOMIA (MENESTHO) .EQUISCULPTA Carpenter. 



Plate 20, figs. 3. ?,u. 



Odostomia (Evalea) xquisculpta Carpenter, Ann. Mag. Nat. Hist., 3d ser., vol. 

 14, 1864, pp. 46, 47 =Odostomia (Oscilla) a;quiscidpta (Carpenter) Dall and 

 Bartsch, Mem. Cal. Acad. Sci., vol. 3, 1903, p. 284, pi. 1, figs. 3, 3a (part). 



Shell elongate-ovate, semitranslucent. Nuclear whorls deeply 

 obliquely immersed, the tilted edge of the last only being visible. 

 Post-nuclear wjiorls rounded, somewhat inflated, marked by strong, 

 well-rounded, ec(ual sj)iral keels, of which 4 occur u])on the first, 5 

 on the second, and 6 between the sutures u]^on the penultimate 

 turn, half of the peripheral one falling iti the suture; here too there 

 is a tendency in the one at the summit to become split. Periphery 

 and base of the last whorl w'ell rounded, marked by six spiral cords, 

 which grow successively weaker from the periphery to the base. 

 Spaces between the cords and spire and base narrow, marked by 

 numerous, decidedly retractive axial threads. Sutiu'e well im- 

 pressed. Aperture broadly oval, somewhat effuse anteriorly; pos- 

 terior angle acute; outer lip thin, showing the external sculpture 

 wuthin; columella strong, decidedly reflected anteriorly, reenforced 

 by the base, provided with a small fold at its insertion; parietal wall 

 covered with a faint callus. 



The type (Cat. no. 16221, U.S.N.M.) comes from Cape St. Lucas. 

 It has four post-nuclear whorls and measures: Length 2 mm., diam- 

 eter 1.2 mm. 



odostomia (MENESTHO) HARFORDENSIS Dall and Bartsch. 



Plate 21, fig. 3. 



Odostomia { Menestho) harfordensis Dall and Bartsch, Proc IT. S. Nat. Mus., vol. 

 33, 1907, p. 521, pi. 46, fig. 5. 



Shell elongate-ovate, bluish-white. Nuclear wliorls smooth, ob- 

 lic(uely immersed in the first of the succeeding turns, only tw^o- 

 tliirds of the last volution projects above them. Post-nuclear whorls 

 well rounded and somewhat inflated, marked by numerous incre- 

 mental lines and five equally strong, but irregularly distributed, 

 punctate, incised, spiral lines between the sutures. The two near 

 tlie summit are placed closer to each other than any of the others, the 

 space between the summits and the second line being about equal to 

 the space inclosed ])etween the first and second supra-peripheral 

 lines. The third line falls on about the middle of the exposed por- 

 tion of the whorls and is a little nearer to the second line than the 



