DALL: MOLLUSCA AND BRACHIOPODA. 361 
Cadulus (Gadila) platystoma PILSBRY AND SHARP. 
Cadulus platystoma Pilsbry and Sharp, Man. Conch., 1898, 17, p. 180, pl. 35, figs. 
17, 18. 
U. 8. S. “Albatross,” station 2792, off Manta, Ecuador, in. 401 fathoms, mud, 
bottom temperature 429,9 F. U.S. N. Mus. 107,699. 
Somewhat like C. poculum, of the Atlantic, in being markedly bent, with the 
tube compressed anteriorly, but in the Pacific species the inflation is greater and 
hot angulate, and the posterior part of the shell less attenuated. C. peruvianus 
is stouter, with a proportionately larger oral aperture. 
Cadulus (Gadila) peruvianus Dar, n. 8p. 
Shell milk-white, smooth, polished, arcuate, inflated; aperture oblique, the 
form oval, with the dorsoventral diameter shorter; equator nearly at the anterior 
third, the anterior part contracting markedly from the equator forward but 
Without angularity ; posterior portion not greatly attenuated, rather unusually 
large for the genus, the anal aperture apparently circular and simple. Length, 
12.3; anal end to equator, 8.3 ; perpendicular between shell and chord, 1.0; max. 
diam., 3.0; of oral aperture, 9.0; vertical of do., 1.6; anal aperture, 1.0 mm. 
U. S. $, “ Albatross,” station 4654, off Point Aguja, Peru, in 1036 fathoms, 
mud, bottom temperature 389.5 F. U. S. N. Mus. 110,671. Also at station 
2807, near the Galapagos Islands, in 812 fathoms, ooze, temperature 389.4. 
The oral aperture is notably oblique, being inclined at an angle of some 40°. 
The shortness and stout form of this species sufficiently differentiate it from 
Others of the region. 
PELECYPODA. 
PRIONODESMACHA. 
(A. Margo edentato,) 
Solenomyacea. 
Solenomyacidae. 
SOLEMYA LAMARCK. 
Solemya Lamarck, An. s. Vert. 1818, 5, p. 488. lat sp., S. australis Lam., l.c. 
selected as type by Bowdich, 1822, and Blainville, 1825. 
This genus was first brought to notice in 1793, by Ulysses von Salis Marsch- 
lins in the second edition of his Neapel Reise, where he named a specimen from 
