250 Proceedings of the Biological Society of Washington. 



cutcheon is linear or absent ; the right valve has a large central and a small 

 lamellar cardinal tooth on each side of it; there are two rather weak left 

 cardinals; the interior margins are conspicuously fluted in harmony with 

 the external sculpture. Length 11; height 10; diameter 6 mm. U. S. N. 

 Mus. Cat. No. 211,887, U. S. Fish Commission station 2901, off Santa Rosa 

 Island, California, in 48 fathoms, mud, bottom temperature 55° F. 



This is close to the fossil V. monilicosta of Gabb, which is a larger shell 

 with less emphatic nodulation, a larger lunule and one or two more ribs on 

 the average. 



Lora babylonia, new species. 



Shell small, whitish, turrited, with about six whorls, the nucleus defect- 

 ive, the suture distinct, not appressed; spiral sculpture of a strong keel at 

 the shoulder and on the base four or five feeble threads, the canal without 

 spiral sculpture; axial sculpture of (on the last whorl about 18) rounded rib- 

 lets retractive behind the keel, protractive in front of it, straight, forming 

 a nodule at the intersection with the keel and with wider interspaces ; aper- 

 ture short and wide, simple, the anal sulcus coinciding with the end of the 

 keel. Height 11, diameter 4 mm. U. S. N. Mus. Cat. No. 214,192. U.S. 

 Fish Commission station 3346, off Tillamook Bay, Oregon, in 786 fathoms, 

 sand, bottom temperature 37.3° F. 



/Esopus sanctus, new species. 



Shell small, light pinkish brown, with somewhat less than five whorls, of 

 which one is composed of a globose smooth nucleus; suture distinct, the 

 whorls moderately convex, the aperture simple, short, the columella smooth, 

 twisted, shorter than the outer lip, the whole surface minutely evenly spir- 

 ally striated. Height 4.3; of last whorl 2.0; diameter 1.6 mm. U. S. N. 

 Mus. Cat. No. 308,958. Todos Santos Bay, near San Diego, California. 



Petaloconchus montereyensis, new species. 



Shell yellowish white, closely irregularly loosely coiled, occurring in 

 masses, the sculpture of crowded concentric wrinkles with, on the earlier 

 part of the shell, an occasional obscure longitudinal ridge; the internal 

 lamellae occur only in the earlier coils, the later portion shows no traces 

 of them; the maximum diameter at the aperture is two millimeters. U. S. 

 N. Mus. 334,650. Monterey, California. 



Tritonalia interfossa beta, new variety. 



Shell resembling T. barbarensis Gabb but stouter and without the re- 

 curved spines at the shoulders; reddish brown, of more than five whorls, 

 the nucleus defective, the whorls somewhat turrited by an angular shoulder; 

 axial sculpture of (on the last whorl six including the terminal varix, on the 

 penultimate whorl seven) angular ribs, prominent at the shoulder and ex- 

 tending to the canal; these are crossed by about 14 densely imbricate spiral 

 cords, subequal and equally spaced, with narrow interspaces; terminal varix 

 heavy. Aperture small, the margin continuous, the outer lip with four or 

 five low denticles internally, the pillar smooth, the canal closed, rather short. 



