ACADEMY OF SCIENCES. 95 



The localities given by Stimpson for this abundant species range from 

 Sitka to Monterey, and I have two young specimens among miscellanea, col- 

 lected at Magdalena Bay, Lower California. 



No. 25. San Francisco market, dried, male. W. N. Lockington. 



Cancer gracilis. Dana U. S. Ex. Exp., I, 153, pi. VII, f. 2. Stimpson, 

 Proc. Cal. Acad. Sci., I, 88; Crust, and Ech. Pac. S. N. A., 20. 



The only specimens I have yet seen are those in the museum of the Cal. 

 Acad. Sci. 

 No. 26. Two females, dried. Locality unknown. 



Cancer productus. Kandall. J. A. N. S., Phil., VIII, 116. Dana, U. S. Ex. 

 Exp., I, 156, pi. VII, f. 3. Stimp., Proc. Cal. Acad. Sci., I, 88. 

 Platycarcinus productus. Gibbes. Proc. Am. Asso., 1050. p. 177. 

 Stimpson, Crust, and Ech. Pac. S. N. A., 21. 



This species has been found at Paget Sound, Tomales Bay, S. F. Bay, 

 San Diego, and Magdalena Bay, L. C. 



No. 27. Several young specimens from Monterey, dried. Dr. J. G. 

 Cooper. 



No. 28. Young, dried. San Diego. Hy. Hemphill. 



No. 40. Male, in spirits. S. F. Bay. W. N. Lockington. 



Not only are the young of this species very different in appearance from 

 the adult, but they are so variously striped and marked that a superficial ex- 

 amination might cause them to be considered the young of several distinct 

 species. The specimen described by Dana was not fully grown, and, like all 

 the immature specimens I have seen, had the teeth of the produced front 

 low and like lobes, with a short suture on the carapax between each lobe and 

 the next. In the adults, the teeth of the front are more separate and more 

 acute, and the central tooth more produced than the lateral ones; moreover, 

 the nine antero-lateral teeth are distinctly separated from each other, and the 

 body near the antero-lateral margins is thicker than in the vpung. 



The prevailing color of the adult is red, becoming darker and more brown- 

 ish above, and orange or yellowish below. Among four young ones found 

 under stones at Monterey, two are chocolate, with a somewhat darker tint on 

 the elevated parts of the carapax; a third, bright yellow, with irregular 

 blotches of dark red; and the fourth, yellow, with narrow red stripes, giving 

 it a zebra-like appearance. 



An examination of young and adult specimens only would lead to the be- 

 lief that they were distinct species, but a full series of specimens, of all sizes 

 and ages, reveals their specific identity. 



This species is common in the bay of 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, 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 



Proc. Cal. Acad. Sci., Vol. VII.— 7, 



