1921] Schmitt: The Marine Decapod Crustacea of California 221 
the upper hinge joint; dark color on dactyls of chelipeds reaching less than one- 
half the length of the outer margin. 
Dimensions.—Type, length hardly 25.4 mm., ‘‘but probably attains a greater 
size’? (Randall). A series of twenty-eight mature males and females measured 
by Weymouth ranged from 24.5 mm. to 173.5 mm. in width. 
Color.—The prevailing color of the adult is red, becoming darker and more 
brownish above, and orange or yellowish below. Among four young ones found 
under the stones at Monterey, two are chocolate color, with a somewhat darker tint 
on the elevated parts of the carapace; one is bright yellow, with irregular blotches 
of red; and the fourth is yellow with narrow red stripes, giving it a zebra-like 
Fig. 136. Cancer productus, X about % (after R. Rathbun). 
appearance. An examination of young and adult specimens only would lead to 
the belief that they were distinct species, but a full series of specimens, of all sizes 
and ages, reveals their specific identity (Lockington). 
Weymouth describes the coloration as follows: 
The adult color of a dark red above, below a dirty white or yellowish white 
is not invariable, though there are no striking differences; some adults show a 
light red above due to minute red spots, not so numerous as in the case of the 
darker color on a yellowish ground. The longitudinal colored lines of the im- 
mature specimens as described by Holmes is not the invariable youthful colora- 
tion; various mottled patterns are also found and occasionally the red of the 
adult. 
Type Locality—Western America. 
Distribution.—From Kadiak, Alaska, to Magdalena Bay, Lower California. 
Remarks.—This species is common in the bay at San Francisco, but I have 
never found either it or its young beneath the stones on the beach, as is the ease 
at Monterey. In April of this year [1876] half an hour’s search under the stones 
at Preston’s Point, Tomales Bay, procured me twelve fine adult specimens, all or 
most of them females. I did not observe any ova attached to them, and I thought 
it singular that on a second visit to the spot in July, I could not find a single 
specimen, though at low-tide mark I secured an overgrown male who had lost too 
many limbs to retreat with sufficient quickness (Lockington). 
