1921] Schmitt: The Marine Decapod Crustacea of California 91 
below. Third maxillipeds with antepenultimate segment outwardly dilated, as in 
C. alba. Hands slightly widened distally, shorter and broader than in C. alba, 
the length being barely twice the width; anterior margin more transverse than 
longitudinal. Antennal scale shaped as in C. alba but much shorter, being only 
a little over half as long as the carapace. 
Dimensions.—Type: length 55 mm.; length of carapace 15 mm., of antennal 
scale 10 mm. The Bay specimens range up to 54 mm. in length, the largest taken 
an ovigerous female; the general average is between 34 and 47 mm. 
Type Locality.—Trinidad, Humboldt County, California. 
Distribution.—Chirikof Island, Alaska, to Santa Cruz, California, to a depth 
of 26 fathoms. 
Biological Survey of San Francisco Bay—Crago stylirostris is pri- 
marily a bottom-dweller, living on a more or less hard, sand or sandy 
bottom, occurring principally in that portion of the middle bay lying 
west of Alcatraz, Angel Island, and the head of Raccoon Strait, 
exclusive of Richardson Bay (see plate 7), as well as outside, where, 
however, it was not found beyond the 26 fathom line. Crago styli- 
rostris was taken at only three hydrographic stations (H 4996 middle 
bay; H 5005, 5015 lower hay, only one specimen at each). 
In the upper bay this species was taken at but 9% (2) of the 
dredging stations at the extreme lower end between Points San Pedro 
and San Pablo; in the middle bay at 38% (28) of the stations, of 
which 75% (21) were in the western section defined above, inclusive 
of Golden Gate; in the lower bay at only 5% (2); and outside at 
47% (8) of the stations. Of the eleven eastern middle, upper, and 
lower bay stations, only 9% (1) returned more than eleven speci- 
mens and then only a total of thirty-three, while on the other hand 
not less than 47% (17) of the thirty-six western middle bay and out- 
side stations returned more than twelve, 22% (8) returned more than 
thirty-three specimens. At five (62%) of these eight stations, fifty 
and more specimens were obtained. 
With respect to the character of the bottom as stated above, we 
find that thirty-one (77%) of the stations at which Crago stylirostris 
was dredged had a more or less hard, predominantly sandy bottom, 
of which eighteen (58%) were purely sand bottoms, while thirteen 
(42%) contained a considerable admixture of gravel, rock, or stones; 
six (15%) of the stations were made on a muddy sand or sandy mud 
bottom; and only two (5%) on a purely mud bottom; the bottom at 
one (2%) of the stations was not characterized. 
The extremes of temperature and salinity to which the distribution 
of this species subjects it, ranged, respectively, from 8.7° to 16° C, 
and from 17.5 to 34.1. 
