298 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.56. 



entirely smooth; aperture parallel with the body, very narrow, body 

 with no perceptible enamel, pillar very short, thickened, slightly 

 reflected with a minute cliink behind it; length of shell, 9.5; diam- 

 eter, 3.6 mm. U. S. Nat. Mus. Cat. No. 105501. 



Type-locality. — Scammon Lagoon, Lower California, collected by 

 Henry Hemphill. Its range extends north to San Pedro, California. 



This is larger, smoother, and less distinctly spinose in the adult 

 than any other west coast species. 



VOLVULELLA CALIFOKNICA. new species. 



Shell minute, polished, white, elongate-ovate, involved, with a 

 short apical spine; axial sculpture of very faint incremental lines; 

 spiral sculpture of microscopic striae licar the anterior end; axis 

 imperforate; aperture as long as the sliell, outer lip reaching to the 

 end of the spine, from which it is separated by a narrow groove, 

 laterally straight, anteriorly rounding to the slightly thickened 

 pillar; body with a coat of enamel which extends to the pillar and 

 the spine; length, 4; diameter, 1.7 mm. U. S. Nat. Mus. Cat. No. 

 211303. 



Type-locality. — U. S. Fish Commission station 2902, off Santa Kosa 

 Island, California, in 53 fathoms sandy mud; the bottom tempera- 

 ture, 45° F. 



VOLVULELLA PANAMICA. new species. 



Shell small, involved, ivory white, smooth except for very famt 

 incremental lines, apex with a small short sharp spine extending 

 beyond the edge of the outer lip; form subcylii dric, aperture very 

 narrow with a deep apical sulcus, base romided, pillar very short 

 with a slight twist; length of shell, 4.25; diameter, 1.75 mm. U. S. 

 Nat. Mus. Cat. No. 212654. 



Type-localiiy.—'Piin&mii Bay at station 2799, in 29^ fathoms, 

 U. S. Fish Commission. 



VOLVULELLA CATHARIA, new species. 



Shell small, plump, ovate, ivory white, involved, with a hardly 

 perceptible point at the apex; surface polished; aperture almost or 

 quite equal in length to the shell, narrow, wider in front, the outer lip 

 nearly straight laterally; near the apex and at the pillar the enamel 

 on the body is slightly reflected with a free edge; there are a few 

 hardly perceptible spiral striae, with wider interspaces, near the 

 anterior end; the shell, for so small a species, is relatively thick; 

 length of shell, 2.75; diameter, 1.8 mm. U. S. Nat. Mus. Cat. No. 

 211784. 



Type-locality.— IJ. S. Fish Commission station 2794, in Panama 

 Bay, in 62 fathoms, sand; bottom temperature, 60° F. 



