522 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxin. 



decidedly curved, reenforced l\y the attenuated base, free only at its' 

 anterior extremity, where it is somewhat revolute, provided with a 

 prominent fold at its insertion which appears as th(^ thickened inflec- 

 tion of the columella; parietal wall covered by a thin callus 



The type (Cat. No. 196250, U.S.N.M.) comes from Pacific Grove, 

 Monterey, California. It has 5 post-nuclear whorls and measures: 

 Length 3.9 mm., diameter 2.1 mm. 



Subgenus EVALEA A. Adams. 



Ecalea A. Adams, Ann. Mag. Nat. Hist., VI, 1860, p. 22; + (Mdma De Folij^, 

 Fonda de la j\Ier, 1870, p. 214; -^AuricuUv a Gray, Proe. Zool. Soc, 18-17, p. 

 159; -\-Ptychostomon Locard, Prod, de les Moll, de France, 1886, p. 228. 



Odostomias having the surface marked by fine incised spiral lines. 

 Type. — Evalea elegans A. Adams. 



KEY TO SPECIES OF EV.\LEA. 



Shell umbilicated tillamookensis. 



Shell not umbilicated. 



Periphery of the last whorl decidedly aiigulated angidaris. 



Periphery of the last whorl subangulated. 



Spiral sculpture uniform jewctti. 



Spiral sculpture consisting of weak and strong lirations infiata. 



Periphery of the last whorl well rounded. 

 Shell elongate-conic. 



Adult shell more than 8 nun. long columbiana. 



Adult shell less than 5 mm. long deUciosa. 



Shell ovate. 



Spiral sculpture uniform over the entire surface. 



Diameter of adult shell 2.5 mm (acomaensis. 



Diameter of adult shell 1.3 mm raldezl. 



Spiral sculpture strongly developed on the early whorls, obsolete on 

 the last. 



Shell white, porcellanous phanea. 



Shell straw-colored tenuisculpta. 



ODOSTOMIA (EVALEA) TILLAMOOKENSIS, new species. 

 Plate XLVll, tig. 1. 



Shell elongate-conic, thin, yellowish-white. Nuclear whorls sur 

 rounded by the first of the succeeding turns and so immersed as to 

 give the apex a broadl}' truncated appearance. Post-nuclear whorls 

 inflated, evenly strongly rounded, very slightly shouldered at the 

 simimit, separated by well-marked sutures. Periphery and base of 

 the last whorl well rounded, the latter inflated, narrowl}^ openly 

 umbilicated. Entire surface marked by numerous fine, wavy, sub- 

 equal, weakly incised spiral lines, of which about 35 occur between 

 the summit and the periphery of the last whorl and about an equal 

 number on the base. Aperture oval; outer lip thin; columella 

 slender, evenly gently curved, and slightly revolute, free, not reen- 



