N0.1574. WEST AMERICAN PYRAMIDELLID.E— BALL AND BARTSCH. 527 



ODOSTOMIA (EVALEA) TENUISCULPTA Carpenter. 



Plate XLVII, fig. 6. 



Odostomia tenuisculpta Carpenter, 2nd Rept. Brit. Ast^oc Adv. Sci., 1864, p. 659; 

 Ann. Mag. Nat. Hist., XV, 1865, p. 30. 



Shell elongate-ovate, yellowi.sh, with the early whorls .spirally lirate 

 and the later ones 011I3' obsoletel}" so. Nuclear whorls small, smooth, 

 obliqueh' almost completely immersed in the first of the succeeding- 

 turns. Post-imclear whorls evenly well-rounded with appressed sum- 

 mits. The first three marked between the sutures b,y many subequal 

 lirfe of which there arc about 15 on the second turn. On the last two 

 turns these lirations become quite obsolete. Periphery and base of 

 the last whorl inflated and well-rounded, marked b}- very feeble spiral 

 striation and lines of growth. Aperture moderately largo, oval; 

 somewhat etiuse anteriorly; posterior angle acute; outer lip thin; 

 columella strongly curved, reenforced partly by the attenuated l)ase, 

 moderately reflected anteriorly bearing a strong fold at its insertion 

 which appears as if it were the inflected termiimtion of the columella. 



Doctor Carpenter's tvpe (Cat. No. 15520, U.S.N.M.) is a young indi- 

 vidual. It was collected by J. G. Swan at Neah Baj^, Washington, 

 has 3 post-nuclear whorls, and measures: length 2.3 mm., diameter 

 1.7 mm. The adult characters were described from two specimens 

 (Cat. No. 46483, U.S.N.M.), collected by J. G. Swan at Neah Bay. 

 Washington. One of these, the one figured, has 6 post-nuclear 

 whorls and measures: length 5.3 mm., diameter 2.0 mm. A specimen 

 collected by Merrihew (Cat. No. 196247, U.S.N.M.), at Port Harford, 

 California, bears a slender raised cord on the periphery of the whorl. 



The large series of specimens in the U. S. National Museum proves 

 conclusiveh" that O. stramhiea Carpenter is the smooth southern rep- 

 resentative of the species. 



The U. S. National Museum has the following material: 



Specimens of Odoslomia {Eralea) tenuinculpla Carpenter. 



