of the Pacific Shores of North America. 461 



CANCER PRODUCTUS. Randall. 



Cancer productus, Randall ; loc. cit. viii. 116. Dana; U. S. Exploring Expe- 

 dition, Crust, i. 156, Pi. VII. f. 3. Stimpson ; Proc Cal. Acad. Nat. Sci. i. 88. 

 Platycarcinus productus, Gibbes ; Proc. Am. Assoc. 1850, p. 177. 



This species was described by Randall from young 

 specimens, which differ much from the adult, both in pro- 

 portions and markings. Having seen only large individuals 

 at the time my paper in the Proceedings of the California 

 Academy was written, I there proposed for them the name 

 C. perlatus, in case they should prove different from Ran- 

 dall's species. But the possession of a full series of all 

 ages, and the examination of the original specimen at Phil- 

 adelphia, has now convinced me of their identity. Dana's 

 specimens appear also to have been young, and his descrip- 

 tion will scarce apply to the adults, in which the teeth on 

 the front and antero-lateral margin are sufficiently projecting 

 and well separated. 



The produced and elevated front is the most prominent 

 character of this species. The female is rather more con- 

 vex than the male. The greatest width is at the penulti- 

 mate lateral tooth. The postero-lateral margin is emargin- 

 ated, as in the preceding species. Surface of the carapax 

 unequally granulose, most so toward the margins and on 

 the teeth. Hand tuberculous above, scarcely cristate, the 

 projections being few and blunt ; the exterior surface 4-cari- 

 nate. Posterior feet rather compressed ; third articles in all 

 ciliate along the superior edge ; tarsi with three longitudinal 

 brushes of short, thick hair along the angles, the superior 

 one in the fifth pair and the posterior one in the other pairs 

 being often obsolete. The terminal article of abdomen in 

 the male is triangular, elongated, with an acuminated ex- 

 tremity, the sides being concave. 



This species is of a dark red or madder color above ; feet 

 mottled ; below dirty white. The following are the dimen- 

 sions of several specimens : — 



