192 BULLETIN GS, UNITED STATES NATIONAL MUSEUM. 



one anterior to it. In addition to these five strongly incised lines 

 there are numerous very fine and closely spaced spiral strife which 

 cross all parts of the surface of the shell. Periphery and base of 

 the last turn inflated, the latter marked by lines of growth and eight 

 strongly incised, punctate spiral lines, which are a little less strongly 

 impressed and a little more closely spaced at the umbilical area than 

 at the peripheral part of the base. These lines ec^ual those of the 

 spire in strength. Sutures constricted. Ajierture very large, some- 

 what effuse anteriorly; posterior angle acute; outer lip thin, showing 

 the external sculpture within; columella curved, reenforced by the 

 attenuated base and provided with a strong fold and its insertion; 

 parietal wall covered by a thin callus. 



The type (Cat. no. 196299, U.S.N.AI.) was collected by Mrs. Merri- 

 hew^, at Port Harford, California. It has five post-nuclear whorls 

 and measures: Length 3.2 mm., diameter 1.8 mm. 



ODOSTOMIA (MENESTHO) SUBLIRULATA Carpenter. 

 Plate 20, fig. 4. 

 Odostomia sublirulata Carpenter, Cat. Mazatlan Shells, 185(5, p. 410. 



Shell elongate-ovate, milk-white. (Nuclear whorls ?) Post- 

 nuclear whorls moderately rounded, smooth betw^een the well im- 

 pressed sutures. Periphery of the last whorl somewhat angulated. 

 Base slightly elongated, w^ell rounded, marked by seven subequal 

 slender, raised spiral cords which are separated l^y channels al)out 

 one-half as wide as the cords. Aperture oval; posterior angle acute; 

 outer lip thin, decidedly thickened within; columella straight, rather 

 thick, somewhat reflected over the umbilical chink; provided with 

 an oblique fold at its insertion. 



The type was taken from a Spondylus at Mazatlan, Mexico; it is 

 on tablet 1952, Liverpool collection, British Museum. It has five 

 post-nuclear turns and measures: Length 2 mm., diameter 1 mm. 



Subgenus EVALEA A. Adams. 



Evalea A. Adams, Ann. Mag. Nat. Hist., voL 6, 1860, p. 22; +Ondina de Folin, 

 Fonds de la Mer, 1870, p. 214; type, Ondina sulcata de Folin; -\- AuricuUna 

 Gray, Proc. Zool. Soc, 1847, p. 159; type, Odostomia ohliqua Alder; +Ptycli- 

 ostomon Locard, Prod, de les Moll, de France, 1886, p. 228; type, Turbo 

 conoideus Brocchi. 



Odostomias having the surface marked by fine incised si)iral lines. 

 Type. — Evalea elegans A. Adams. 



