462 Stimpson on the Crustacea and Echinodermata 
Locality. Sex. Gargpax. — Campus, Proportion 
San Francisco, d 2.95 inch. 4.90 inch. 1:1.63 inch. 
K E z 2.56 4.18 1:1.63 
a T ^" 2.47 4.01 1:1.62 
z x rd 2.46 4.00 1:11.62 
Tomales Bay, e 2.85 3.78 1:1.60 
San Francisco, bs 2.27 8.66 1:1.60 
e es ie 2.10 3.36 1:1.60 
= g Ed 1.97 3.05 1:1.55 
S m x 0.99 1.29 1:1.30 
“ [T1 9 2.84 4.30 1:1.52 
Tomales Bay, " 2.73 4.20 1:1.54 
San Francisco, sii 2.15 3.34 1:1.55 
Tomales Bay, a 2.16 3.32 1:1.54 
p T " 2.00 3.07 1:11.54 
Here it will be perceived that the male is wider than the 
female; and also that the males steadily increase in width 
with age, while the females show some variation. The 
great breadth in this species renders it easily distinguishable 
from its congeners. 
Distortions of the antero-lateral teeth often occur, render- 
ing the sides somewhat unsymmetrical. i 
This Cancer is common at San Francisco, and is sold in 
the markets with C. magister: It was also found at Tomales 
Bay by Mr. Samuels, and in Puget Sound by the Explor- 
ing Expedition. 9 
Mus. Bost. Soc.; Smithsonian; Phil Acad.; Pars; 
Acad. Petrop. á 
CANCER ANTENNARIUS. Stimpson. 
Plate XVIII. 
Cancer antennarius, Stimpson ; Proc. Cal. Acad. Nat. Sci. i. 88. 
Carapax convex; greatest breadth at the penultimate 
antero-ateral tooth. Superior surface much sud 
very smooth in appearance, but minutely granulated ; e 
granulation being almost obsolete about the middle, 
sufficiently well marked towards and at the margin. Antero- - 
