of the Pacific Shores of North America. 461 
CANCER PRODUCTUS. Randall. 
Cancer productus, RANDALE ; loc. cit. viii. 116. Dana; U. S. Exploring Expe- 
dition, Crust. i. 156, Pl. VIL f. 3. Srimpson; Proc. Cal. Acad. Nat. Sci. i. 88. 
Platycarcinus productus, GIBBES ; Proc. Am. Assoc. 1850, p. 177. 
This species was described by RanpaLL from young 
specimens, which differ much from the adult, both in pro- 
portions and markings. Having seen only large individuals 
atthe 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 i- 
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- 
“ions of several specimens :— 
