460 Stimpson on the Crustacea and Echinodermata 
reddish-brown color, darkest anteriorly, often light orange 
below ; inner sides of the anterior feet and hands crimson. 
Mus. Smithsonian ; Expl. Exped.; Phil. Acad. 
CANCER GRACILIS. Dana. 
Cancer gracilis, Dana; U. S. Exploring Expedition, Crust. i. 153, Pl. VIL f 2. 
Srimpson ; Proc. Cal. Acad. Nat. Sci. i. 88. 
This is the smallest species of the genus known, although 
found of a much larger size than that figured by Dana. It 
may be distinguished from the young of C. magister-by the 
emargination or slight tooth on the postero-lateral margin 
near its outer extremity, as well as by its proportions. It 
differs from C. irroratus, (C. Sayi, Govrp,) which also pos- 
sesses the postero-lateral emargination, by its smoother and 
more slender tarsi, and by the granulation of the central 
portions of the carapax. "The antero-lateral margins are 
nine-toothed. Lateral teeth of inter-antennary front deeply 
separated from, and much larger than, the middle one, 
although not projecting so far forward. Third article of 
outer maxillipeds smooth, with the exterior apex rounded. 
Terminal segment of abdomen in the male elongate-trian- 
gular, with a slender, pointed extremity. The following 
are the dimensions of several specimens now before me :— 
Tomales Bay, fy l.5l inch.  2.30inch. 1:152 inch 
T r: i 1.60 2.4 1:1.50 
d d « b 4 25 11.50 
Puget Sound, 9 1.90 2.80 11.47 
Tomales Bay, “ 1.45 9.13 11.47 
We may thus notice that in this species the males are 
wider than the females. 
Puget Sound, (Suckley ;) Tomales Bay, (Samuels ;) San 
Francisco Bay, (Expl. Exped.) " 
Mus. Expl Exped.; Smithsonian; Bost. Soc-; Ph 
Acad.; Acad. Petrop.; Paris; etc. 
