WEST AMF.PtlCAN PYRAMIDELLID MOLLUSKS. 189 



ODOSTOMIA (MENESTHO) ENORA, new species. 

 Plate 21, fig. 2. 



Shell elongate-ovate, milk-white. Nuclear whorls deeply obliquely 

 immersed in the first of the succeedino; turns, above which only the 

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

 rounded, slightly contracted at the sutures and weakly shouldered at 

 the summits, marked between the sutures by four feebly incised 

 spiral grooves of which the second one above the periphery is the 

 weakest. Periphery of the last whorl somewhat inflated. Base well 

 rounded posteriorly, somewhat attenuated anteriorly, marked by 

 four subequal but unequally spaced incised spiral lines. Aperture 

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

 thin; columella slender, slightly curved and somewhat re volute, pro- 

 vided with a weak fold at its insertion. 



The type and two specimens (Cat. no. 207126 U.S.N.M) come 

 from San Pedro, California. The type has six post-nuclear whorls 

 and measures: Length 2.8 mm., diameter 1.3 mm. 



ODOSTOMIA (MENESTHO) CHILENSIS, new species. 

 Plate 21, fig. 6.- 



Shell milk-white. (Nuclear whorls decollated.) Post-nuclear 

 whorls well rounded, slightly constricted at the suture and moder- 

 ately shouldered at the summit, marked by four pitted spiral grooves, 

 three of which divide the posterior two-thirds between the sutures 

 into three almost equal areas, while the fourth is at the periphery. 

 The space between the peripheral grooves and the one posterior to 

 it is equal to one-third the space between the sutures. These grooves 

 as well as those on the base are crossed by many slender axial riblets 

 which break them u]) into pits. The raised spaces between the 

 grooves are marked by slender lines of grow^th and many extremely 

 fine spiral striations. Suture well impressed. Base of the last 

 whorl well rounded, marked by seven pitted, well incised lines and 

 microscopic spiral striations. Aperture broadly ovate; posterior 

 angle acute; outer lip thin; columella slender, curved, decidedly revo- 

 lute, provided with a strong oblique fokl at its insertion; parietal 

 wall covered with a thin callus. 



The type (Cat. no. 109363 U.S.N.M.) was taken from the anchor 

 of the Bureau of Fisheries steamer Albatross at Tome, Cliile. It is 

 a fragment consisting of the last three whorls (the nucleus and prob- 

 ably the first two post-nuclear whorls being lost), and measures: 

 Length 2.3 mm., diameter 1.2 mm. 



ODOSTOMIA (MENESTHO) FETELLA. new species. 

 Plate 21, iigs. 9, 9a. 



Shell very elongate-ovate, milk-white. Nuclear whorls small, 

 obliquely two-thirds immersed in the first of the succeeding turns. 



