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" (Eandall). 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 



Cancer productus, X about % (after E. 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. 



Bemarks. — 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 case 

 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). 



