98 
scars unequal, the right one larger. Lon. of shell 51, lat. 36, alt. 
13 mm. This shell was received from Dr. L. G. Yates, of Santa 
Barbara, who obtained it from a dealer at Monterey, Cala., who 
asserted it to have been obtained alive from the bay of Monterey. 
Two specimens were obtained, which the possessor would neither 
lend nor sell; but finally Dr. Yates succeeded in obtaining one of 
them, which he courteously forwarded to the National Museum 
for examination. It can only be compared with §S. gigas von 
Martens, of Japan, in which the furrow is obsolete, and there are 
no secondary ribs, and the primary ribs are feeble, low, wide, 
and obsolete on the anterior part of the shell. If the locality is 
confirmed, the species is a notable addition to the Californian 
fauna.’’—Dall, Nautilus 14:125. 
1440 Lepidopleurus mesogonus Dall. 
Off Queen Charlotte Islands, B. C., in 1,588 fms. 
1441 Lepidopleurus halistreptus Dall. 
Type locality:——off Acapulco, Mexico. 
1442 Lepidopleurus luridus Dall. 
Type locality:—-Panama bay. 
1443 Lepidopleurus farallonis Dall. 
Type locality:—off Farallones Islands, near San Francisco, 
Cal., in 391 fms. 
Chiton small, thin, wide, with a low rounded back and yellow- 
ish-white color; girdle narrow, sparsely spiculose, with very short, 
fine, bristly spicules; jugum hardly defined, with no obvious 
mucro; lateral areas slightly elevated and feebly concentrically 
rugose; anterior valve simple; posterior conspicuously mucronate 
and, behind the mucro, concave; surface entirely covered with 
minute, low, close-set pustules, arranged quincuncially and to 
some extent concentrically from the mucronal points; pleural 
laminz short, subtriangular; ctenidial line reaching the fifth 
valve. Lon. of animal about 10, lat. 5.5, alt. 2 mm. 
1444 Ischnochiton Stearnsii Dall. 
Chiton of moderate size, yellowish or buff color; girdle yellow- 
ish-white, covered with subcylindric, blunt, smooth, close-set, 
large spines, the ends of which have a pebbly appearance, mixed 
with a smaller proportion of small but rather similar spicules; 
ends of large spines, when worn flat, have a pavement-like aspect; 
back not keeled, but rather steeply rounded; gills ambient; inter- 
mediate valves with a dorsal angle of about 90 degrees, the lateral 
areas prominent, with about 5 radial riblets in each, divaricating 
to 7 or 10 at the girdle margin, and cut into beads by numerous 
fine concentric furrows; pleural areas and jugum hardly differ- 
entiated, sculptured with fine, slightly irregular, longitudinal 
wrinkles, finer mesially, crossed by inconspicuous, less elevated 
transverse lines; anterior valve with fine, beaded, divaricate radial 
riblets, the insertion plates and eaves very short, smooth, not 
spongy, with about 17 slits; the posterior valve with a small, low, 
subcentral mucro, from which 2 elevated lines extend to the mar- 
gin, 1 on either side, forming 2 areas,and from which the wrinkled 
sculpture, less prominent on the anterior area, diverges; posterior 
slits about 15, lateral slits 2; sinus rather wide, entire; pleural 
lamine rather wide and short. Lon. of animal about 25, lat. 
15, alt. 6 mm, 
Type locality:—off Farallones Islands, near San Francisco, 
