160 BULLETIN 68, UNITED STATES NATIONAL MUSEUM. 



collection. Another specimen (Cat. no. 74003, U.S.N.M.) was col- 

 lected by Doctor Canfield at Monterey, and a sixth (Cat. no. 196282, 

 U.S.N.M.) by Mr. F. L. Button at the same place. A seventh (Cat. 

 no. 162767, U.S.N.M.) was collected by Mrs. T. S. Oldroyd at San 

 Luis Obispo, California. 



ODOSTOMIA (CHRYSALLIDA) PULCIA, new species. 



Plate 16, figs. 10, 10a. 



Shell small, ovate, vitreous. Nuclear whorls deeply, very ob- 

 liquely immersed in the first of the post-nuclear whorls, above which 

 only the tilted edge of the last volution projects, which is marked by 

 five slender spiral threads. Post-nuclear whorls well rounded, 

 strongly contracted at the sutures and shouldered at the summits, 

 marked by very strong, decidedly retractively curved, axial ribs, of 

 which 16 occur upon the first, 18 upon the second, and 20 upon the 

 penultimate turn. In addition to the axial ribs, the whorls are 

 marked between the sutures by four very broad, low, spiral bands, 

 which are separated by mere impressed lines, and which render the 

 axial ribs feebly tuberculated. Suture subchanneled. Periphery 

 of the last whorl marked by a narrow deep groove, which is not 

 crossed by the axial ribs. Base well rounded, crossed by six spiral 

 cords which grow decidedly weaker and closer spaced from the 

 periphery to the umbOical area, the spaces between them being 

 crossed by numerous slender, axial threads. Aperture oval ; posterior 

 angle acute; outer lip thin, showmg the external sculpture within; 

 columella stout, strongly reflected anteriorly, provided with a weak 

 fold at its insertion. 



The type and 35 specimens (Cat. no. 162763, U.S.N.M.) come 

 from San Pedro, California. The type has four post-nuclear whorls 

 and measures: Length 2.2 mm., diameter 1.2 mm. Seventj^ speci- 

 mens from the same locality were identified for Mrs. Oldroyd. Cat. 

 no. 168568, U.S.N.M., thirty-seven specimens also from San Pedro. 



ODOSTOMIA (CHRYSALLIDA) VIRGINALIS, new name. 



—Evalea gracilienta (Carpenter) Keep, West Coast Shells, 1888; p. 52; not 

 Odostomia gracilienta Monterosoto, 1884. 



Plate 18, figs. 7, la. 



Shell elongate-conic, thin, semitranslucent. Nuclear whorls 

 obliquely immersed in the first of the succeeding turns, above which 

 only the tilted edge of the last volution projects, which is marked by 

 three strongly elevated spiral threads. Post-nuclear whorls well- 

 rounded, moderately contracted at the sutures, and strongly slop- 

 ingly shouldered, marked by weak rounded axial ribs which are best 

 developed near the edges of the shoulder. Of these ribs about 24 are 

 indicated on the. first turn, 18 upon the second to fourth, and 20 upon 

 the penultimate turn. In addition to the axial sculpture the whorls 

 are marked between the sutures by a number of spiral keels of diverse 



