ILL USTRA TIONS OF AMERICAN SHELLS— DA LL. 555 
ZEIDORA FLABELLUM Dall. 
Plate XXXVIII, fig. S. 
Eman/imila flabeUum Dall, Proc. U. S. Nat. Mns., XVIII, 1895, p. 10. 
Off' Clarion Island, Lower California, in 460 fathoms, sand, at station 
2992, U. S. Fish Commission. U.S.N.M., 122577. 
The shell is subtranshicont white. It was crushed b}^ the trawl 
and the fragments held in place b}" the soft parts when received, so 
that it seemed unwise to attempt to free the pieces from the animal 
and the narrow "deck" of the limpet was not discovered. More 
study and careful examination revealed the true genus, to which it is 
accordingl}^ transferred. It is the tirst west coast species of the genus. 
The corrected measurements are: Lon. 12.5; lat. 7.75; alt. 3.26 mm. 
SUEEMARGINULA YATESI Dall. 
Plate XXXVIII, figs. 1, :]. 
Snbemarginulayntesi Dall, Nautilus, XIV, No. 11, Mar., 1901, p. 125. 
Monterey, (klifornia, Dr. L. G. Yates. U.S.N.M., 162062. 
The shell is rude and of a whitish color, somewhat tinged with green- 
ish olive. The furrow and shallow anterior sinus point a little to 
the right of the median line of the shell. It was obtained from a 
dealer in shells at Monterey, who told Dr. Yates that he got two or 
three living specimens from stones brought up in the fishermen's nets 
in the Bay of Monterey. It is a near relative of S. (I'lcjaK Martens of 
Japan. 
LEPIDOPLEURUS MESOGONU-S, new species. 
Chiton of moderate size, yellowish or ashy white, with a narrow 
girdle dusted with very minute spicules; valves laterall}' compressed, 
almost keeled at the jugum, and with the sides meeting there at an 
angle of 69-, slightly rounded at the junction; ))od3^ narrow, ctenidia 
about a dozen on each side, the most anterior even with the front edge 
of the seventh plate; anterior valve simple, without insertioji plates, 
sculptured with moderately strong concentric resting stages and line, 
low, close-set rounded pustules; posterior plate large, similarly sculp- 
tured, with a prominent mucro nearer the posterior than the anterior 
edge of the plate, the anterior and posterior areas hardly defined; 
intermediate valves with the lateral areas more oi- less irregularly 
concentrically ridged, the pleural and jugal tracts less distinctly so, 
the whole covered with uniform pustulation and the inner areas 
defined ver}' obscurely by faint depressions; though angular, the 
jugum is not beaked anteriorly. Lon. of animal about 35; lat. (with 
dry girdle) 9; alt. 6 mm. 
