of the Pacific Shores of Norlh America. 459 
fornian coast. Antero-lateral margin ten-toothed ; teeth but 
little prominent, with the exception of the posterior one, 
which is separated from the next by a considerable space ; 
they gradually diminish in size toward the orbits. Termi- 
nal segment of abdomen in the male short, with a rounded 
extremity. Third article of outer maxillipeds somewhat 
granulated, with the exterior apex broadly truncated. Feet 
of the second pair longest, and equal in length to the width 
of the carapax. In adult specimens the tarsi of the fifth 
pair of feet are very much compressed, and not conspicu- 
ously ciliated below. In a specimen from Sitka, the gran- 
ulation on the upper side of the feet of the posterior pairs 
is much stronger, and the teeth on the crest of the hand less 
numerous and higher, than in Californian specimens. The 
following are the measurements of several specimens in the 
Museum of the Smithsonian Institution :— 
: i ortions of 
per. Sex. rore bbs d phy erint 
Puget Sound, 2 0.875 inch. 1.27 inch. 1:1.45 inch. 
San Francisco, s 1.23 1.8 1 
Monterey, e 2.51 3.77 1:1.50 
San Francisco, « 4.42 7.00 1:1.58 
. Sitka, « 4.90 8.85 vex, ib 
San Francisco, 9 2.55 3.90 1:1.53 
By these measurements and proportions it will be seen 
that this species increases in width with age, and that the 
female is slightly broader than the male. I have seen no 
Specimen according in dimensions with the variety figured 
by Dana. 
. This species was erroneously referred by Ranpaut to C. 
"rroratus, Say. The succeeding species, however, approaches 
much more closely to the eastern crab. - 
C. magister has been found at Sitka, (Trowbridge ;) 
t Sound, (Suckley ;) San Francisco Bay, (Pickering, 
Kennerly, etc, ; and at Monterey, (Taylor) It is the com- 
mon crab of the San Francisco market, and is caught very 
ndantly about the wharves of the city. It is of a light 
