18 PROCEEDINGS OF THE NATIONAL MUSELTlvf Vol.70 



jects, which gives to the shell a decidedly truncated appearance. 

 Postnuclear whorls rather high between the summit and the suture 

 very slightly rounded, appressed at the summit and very slightly 

 contracted at the periphery, marked by very fine lines of growth 

 and numerous, closely spaced, microscopic spiral striations. This 

 sculpture is characteristic for the early whorls as well as the last. 

 Suture slightly constricted. Periphery of the last whorl strongly 

 inflated, rather obtusely angmlated. Base short, strongly rounded, 

 narrowly umbilicated, marked like the spire. Aperture broadly 

 oval ; posterior angle obtuse ; outer lip thin ; inner lip slightly curved, 

 reflected over and appressed to the base and provided with an oblique 

 fold a little anterior to its insertion; parietal wall covered with a 

 thick callus. 



The type, Cat. No. 362450, U.S.N.M., was collected by Dr. R. H. 

 Tremper on rocks at San Clemente Island, California. It has five 

 and one-half whorls and measures, length, 3.6 mm. ; diameter, 1.6 mm. 



Cat. Xo. 362451, U.S.X.M., contains a topotype, and three addi- 

 tional topotypes are in Doctor Tremper's collection. 



ODOSTOMIA (EVALEA) EYERDAMI, new species 



Plate 4, fig. 1 



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

 deeply obliquely immersed in the first of the succeeding turns above 

 which the tilted edge of the last volution only projects. Postnuclear 

 whorls high, moderately rounded, very slightly shouldered at the 

 summit, marked by moderately strong, equal, and equally spaced 

 spiral striations which have about the same strength on all the 

 whorls. Periphery somewhat inflated, well rounded. Base slightly 

 prolonged, well rounded, marked like the spire by lines of growth 

 and spiral striations. Aperture elongate-ovate, protracted at the 

 junction of the base and columella; posterior angle acute; outer lip 

 thin; columella slightly oblique, almost straight, slightly reflected 

 and appressed to the base for about half of its length; parietal wall 

 covered with a thin callus. 



The type, Cat. No. 362149, U.S.N.M., comes from.Shuyak Strait, 

 Afognak Island, Alaska. It has five postnuclear whorls and meas- 

 ures, length, 4.3 mm. ; diameter, 2.0 mm. 



This species is nearest related to Odostomia {Evalea) stephensi 

 Dall and Bartsch, from which it diifers in being constantly, in every 

 way, smaller. 



Cat. No. 362150, U.S.N.M., contains an additional specimen from 

 the type locality, while five are in the collection of Walter J. Eyerdam. 



