138 University of California Publications in Zoology (Vou. 23 
Color.—In formalin body and legs pinkish red. Segments of second and third 
pairs of feet white at distal ends; dactyli striped longitudinally with pinkish and 
white (Rathbun). In life antennae are greenish, with alternating large and small 
golden yellow spots every two or three segments of the flagellum; every segment 
of first ten spotted; distal segment of antennal peduncle not spotted, plain color. 
Distal half of propodi of ambulatory legs white, occasionally with slight reddish 
or pinkish cast, never marked, so far as I have been able to ascertain, with blue; 
the rest of joint marked with stripes of bluish or greenish brown, corresponding 
with stripes as the dactyls; dactyls similar to those of P. samuelis, either without 
orange or with a mere trace of it; stripes distinct and more pronounced through- 
out their length. Large hand often whitish or greenish white. 
Type Locality—Puget Sound. 
Distribution.—St. Paul Island, Pribilofs (T. Kincaid), Aleutian Islands to San 
Diego, California; Siberia, Kamchatka (Rathbun). Japan (Stimpson) (Balss). 
Low tide to 17 fathoms. 
Remarks.—The specimen figured above is very true to type P. hirsutiusculus 
from the Aleutian Islands. I have seen no specimens from California which are 
quite so large as the one figured or with such great length of acicle (antennal 
scale) and breadth of carapace. The carapace as figured appears more squat 
than is often the case. The eye-stalks in the California specimens are proportion- 
ately thicker. 
The breadth of carapace, thickness of eye-stalks, length of antennal scales and 
dactyls, general appearance of the larger hand, and color in life, will always 
serve to distinguish this species from P. samwelis. 
Biological Survey of San Francisco Bay—Pagurus hirsutiusculus 
is the common hermit crab of the bay and is found in littoral and 
more shoal waters, principally of the middle bay where it is well dis- 
tributed (see plate 8). 
There is only one record from the upper bay, a single specimen 
dredged in 4 to 24 feet (D 5757), on a fine grayish-black, very muddy 
sand bottom. Six specimens were obtained at four (10%) of the 
lower bay stations (D 5723, 5766, 5768, 5781), which, except for 
D 5766, where three specimens were obtainéd from a soft mud bottom 
in 3 to 4 fathoms in Alameda Creek, were dredged on more or less 
shelly bottoms, at rather widely distributed stations: D 5723, 914 to 
11 fathoms, ‘‘black, sticky mud streaked with brown, many shells, 
clinkers’’ and abundant ophiurans, off Mission Rock; D 5768, 1 to 3 
fathoms, hard shelly bottom, off Alameda; D 5781, 3 to 12 feet in the 
oyster beds, between Point San Bruno and Point San Mateo. 
In the middle bay Pagurus hirsutiusculus is recorded from thirteen 
(18%) of the dredging stations, of which all but three were made at 
depths varying from 5 feet to 5 fathoms (D 5705, 5708, 5744, 5753, 
5759, 5756, 5763, 5764, 5765, 5773, 57789 5779, 5826). The three 
deeper stations (D 5705, 5708, 5826) ranged from 7 to 12 fathoms 
in depth, and at the deepest of these (D 5708), in 10 to 12 fathoms, 
