1921] Schmitt: The Marine Decapod Crustacea of California 283 
the outer pair; the central tooth is smaller than the others but projects farther 
anteriorly. Merus of outer maxillipeds elongated, rounded anteriorly. Carpus of 
chelipeds with two spines, one above, at distal angle, and a second below this, on 
inner angle; fingers of chelipeds without dark color. Dactyls of ambulatory legs 
slender, not flattened. 
Dimensions.—Type: length of carapace 27.3 mm., greatest width 40.2 mm. 
Specimens collected in San Francisco Bay ranged from 3 to 76 mm. in width of 
carapace. 
Color.—In life color is olive overlaid with minute reddish brown spots, which 
are more numerous on the teeth of the anterolateral margin and on the front, 
giving to the whole a brownish tinge; edges of teeth, under parts, and greater 
portion of legs, yellowish. There is little variation in color among individuals 
and small difference between fresh and alcoholic specimens (Weymouth). 
Type Locality—San Francisco, California. 
Distribution—Kasaan Bay, Prince of Wales Island, Alaska, to Playa Maria 
Bay, Lower California. Shallow water to 56 fathoms (Rathbun). 
Biological Survey of San Francisco Bay.—Cancer gracilis (see 
pl. 6) ranges from a little north of Point San Pedro, in the upper bay 
(D 5716), well down toward the lower end of the lower bay (D 
5847), and outside to the San Francisco bar (D 5733) and the fishing 
grounds (D 5785, and by the commercial trawlers in July, 1912). 
In all it was taken at fourteen dredging stations and at two shore 
stations: Sausalito, along shore and in the seine, and Point Bonita, 
between tide marks. Of the dredging stations only one (D 5716) 
occurs in the upper bay, eight (D 5702, 5742, 5797-5799, 5826, 
5828) in the middle bay, three (D 5802, 5847, 5849) in the lower 
bay, and two (D 5788, 5785) outside. Cancer gracilis occurs more 
abundantly at stations of 12 fathoms and less in depth. Of such 
there are ten at which the average number of specimens taken was 
two and seven-tenths. Of the other four dredging stations at which 
this species was taken, one is intermediate, 10 to 16 fathoms, with one 
specimen, and three exceed 13 fathoms (D 5702, 13 to 17 fathoms; 
D 5742, 20 to 30 fathoms; D 5785, 39 to 40 fathoms), with an average 
of one and three-tenths specimens taken at each. 
There also appears to be a fairly close correspondence between 
depth and number of specimens per haul, and the character of the 
bottom. All of the stations of 12 fathoms or less within the bay 
were made on a predominantly muddy bottom, running from the 
upper bay through the eastern part of the middle bay, behind Angel 
Island, down into the lower bay. The station of intermediate depth 
designated above should be included in this series with respect to 
character of bottom. The outside station of less than 12 fathoms had 
a bottom of ‘‘fine, very clean, gray sand,’’ and returned only a single 
