No. 1610. > NE W PACIFIC COAST MOLLUSKS—DALL. 947 
sided, and very large for the size of the animal. The plates in 
Haminea are quite different, so that, notwithstanding the general 
similarity of the shells, the present species can not be referred to the 
genus Hamined. — 
Genus PEDIPES Seopoli. 
PEDIPES LIRATUS W..G. Binney. 
This species was described from Cape St. Lucas, and many years 
later was collected near San Diego by C. R. Orcutt. Professor Kel- 
sey now carries its northern limit to the village of La Jolla, on the 
seashore north of San Diego. 
Genus TURRIS Bolten. 
(Plewrotoma Lamarck. ) 
Section ANTIPLANES Dall. 
TURRIS (ANTIPLANES) DIAULAX, new species. 
Shell small, acute, conic, brownish, with about nine whorls; 
suture distinct, not appressed; surface smooth, except for incremental 
lines and two impressed shallow spiral channels near the periphery 
of the whorls; the surface just behind each channel is slightly 
raised, forming a flattish band about as wide and high as the chan- 
nel is wide and deep; on the base and canal there are also some faint 
spiral threads; the sides of the spire are flattish, the periphery near- 
est the succeeding suture, which is laid on the anterior edge of the 
anterior channel, thus giving the whorls a sort of overhang in appear- 
ance; aperture short and rather narrow; outer lip sharp, simple, pro- 
duced; anal sulcus narrow and rather deep, situated just behind the 
posterior channel; body without callus; canal short, wide, recurved ; 
pular lip arcuate, smooth. Height of shell, 19.0; of last whorl, 10.0: 
of aperture, 6.5; maximum diameter, 6.5 mm. 
Type.—Cat. No. 110609, U.S.N.M. U.S. 8S. Albatross station 2931, 
off Los Coronados Islands, near San Diego, California, in 34 fathoms, 
sand. 
This is quite a well-marked species, and differs from most of the 
others in its group in its stronger spiral sculpture. 
There is a group of forms on the Pacific coast which have been 
referred by Carpenter to Drillia, in which usage he has naturally 
been followed by the collectors and students of the fauna. This 
group comprises “Drillia” inermis Hinds, D. incisa and D. cancel- 
lata Carpenter, and the following species. Under Pleurotoma, P. 
mermis Hinds, 1844, -is preoccupied by P. inermis Partsch, 18438; 
P. cancellata J. Sowerby, 1827, and about half a dozen others ante- 
date P. cancellata Carpenter, 1863. For énermis Hinds, I would pro- 
pose the specific name ophioderma, and for cancellata Carpenter, the 
