282 CALIFORNIA ACADEMY OF SCIENCES. 



[S. D.] Odostomia (Evalea) stearnsii D. <("■ B., sp. nov. 



Plate I, Fiu. 12. 



Shell regularly elongate-conic, turreted, subumbilicated, milk white; nuclear whorls small, 

 slantingly immersed; post-nuclear whorls rounded, somewhat contracted at base and strongly shoul- 

 dered at the summit; suture profound, channeled; last whorl rather inflated; aperture large, pyriform, 

 posterior angle obtuse, outer lip slightly contracted at the middle; columella decidedly oblique, flex- 

 uous and reflexed, the narrow parietal wall being covered by a faint callus; a weak columellar fold 

 appears opposite the umbilical chink; the entire shell is ornamented with very fine spiral striation. 



Dimensions. — Long. 5.2 mm.; diam. 2.2 mm. 



The type has eight post-nuclear whorls, and is from the post-Pliocene of San 

 Diego, which is the only locality, so far, from which this species has been reported. 



303. Odostomia (Evalea) gouldii Carpenter. 



Plate I, Fig. 15. 



Odostomia (? war.) gouldii Cpr., Ann. Mag. Nat. Hist., 3rd Ser., Vol. XV, 1865, p. 30. 



Shell solid, inflated, shining, subdiaphanous to milk-white; nuclear whorls obliquely im- 

 mersed; post-nuclear whorls rounded, not contracted at base, and but very feebly shouldered at the 

 summits; base and periphery of the last whorl well rounded; aperture large, ovoid, posterior angle 

 acute; outer lip well rounded, its anterior margin somewhat effuse at the junction with the twisted, 

 reflexed and appressed columella; columellar fold very prominent a little anterior to the upper end 

 of the columella; the entire shell is very feebly and closely spirally striated. 



Dim.ensions. — Long. 5 mm.; diam. 2.8 mm. 



The specimen figured has six post-nuclear whorls, and comes from Monterey. 

 The species ranges recent from Alaska to San Diego, Cal., occurring as a post- 

 Pliocene fossil in the last-named place, and also at San Pedro and Ventura. 



Section Amaiira Moller. 



Amaiira Moller, Index Moll. Groenl., p. 7, 1842. Type, A. Candida Moller, 1. c. 



Odostomias of extremely large size, inflated, very heavy, usually devoid of all sculpture, 

 sometimes very minutely spirally striated. 



This genus was supposed to be naticoid, but an examination of the authentic 

 specimens shows its relations to be with the Pyramidellidse. The account of the 

 animal in Fischer's Manual ap^Dears to have been taken from a true naticoid, perhaps 

 Amauro'p?,i?,, which Fischer wrongly includes as a section under Amnura; but this 

 account does not agree with Mijller's original diagnosis, nor with tlie characters of 

 Amaura, as determined from specimens collected in Greenland by Moller, which 

 show, when the back of the shell is ground away, the plait invisible from in front of 

 the aperture. 



