264 WEST AMERICAN “SHELEIES 
white, making the fresh specimen an object of 
great beauty. The mantle border is smooth, thin, 
delicate, and is of a yellowish- brown color. 
Length, about an inch. 
Tonicélla marmorata, Fabr., the Marbled Chi- 
ton, has an oblong shell with valves elevated and 
rather acutely angled. Color, buff, closely speckled 
with dark red; surface apparently smooth, but 
microscopically granulated; length, 27 to 40mm. 
This species lives in the Atlantic and also in the 
North Pacific. 
Tonicélla submarmorea, Midd., the Red-spotted 
Chiton. Valves rather depressed, apparently 
smooth, microscopically full of granules; color, 
rosy or yellowish white, painted with spots and 
flamules of red; length, 38mm. From Fuca 
Strait past Aleutian Islands to Japan. 
Trachydérmon (Cyanoplex) hartwégi, Cpr., 
Hartweg’s Chiton, (Chaetopleura hartwegi), has 
a low oval shell, very closely and microscopically 
granulated, and bears wart-like granules irregu- 
larly seattered over the surface. Externally, dull, 
olive green; internally, intense blue-green; length, 
about an inch. Found along the whole coast from 
Vancouver Island southward. 
Chaetopleura gémmea, Cpr., the Gem Chiton, is 
found at Monterey, Cal. The shell is oblong, ele- 
vated, red, olive-ashen, or yellow. The girdle is 
narrow, leathery, sparsely clothed with short hairs 
that are easily rubbed off. The valves are not 
smooth; length, 16mm. 
