1921] Schmitt: The Marine Decapod Crustacea of California 93 
broad and slightly rounded at extremity, spine exceeding blade. Fifth segment 
of abdomen not carinate. 
Dimensions.—Type: about 76.2 mm. The Bay specimens ranged up to 82 mm. 
in length from tip of rostrum to end of telson for the largest female; the average 
for the greater number of specimens taken is between 47 and 62 mm. 
Color.—Dark and light yellowish gray mottled. Eyes salmon-colored in life 
(Stimpson). 
Type Locality—San Francisco Bay, California. 
Distribution.—Southeastern Alaska to San Diego, California, to a depth of 
29 fathoms. 
Biological Survey of San Francisco Bay. Crago franciscorum is 
universally distributed throughout the bay, extending well up into 
Suisun Bay, from which it is the only deecapod recorded, down into 
the lower bay as far as suitable collecting apparatus was employed 
(D 5847, south of which only oyster tongs were used), and outside 
to the fourteen fathom line. 
It was taken in the upper bay at twenty (91%) of the dredging 
and thirty-five (44%) of the hydrographic stations; in the middle 
bay at fifty-one (70%) of the dredging and thirty-three (30%) of 
the hydrographic stations; in the lower bay at fifteen (39%) of the 
dredging and sixty-nine (64%) of the hydrographic stations; and 
outside at eight (47%) of the dredging stations, only. 
Although taken at seven less dredging stations than Crago 
nigricauda, aS compared with that species Crago franciscorum is 
preponderantly an inhabitant of the upper water layers, being an 
abundant and oft recurring catch of the tow-net. It was taken, in 
all, at one hundred and thirty-seven (45%) of the total number of 
hydrographic stations, of which eighty-six (63%) returned more 
than ten specimens each. 
As Stimpson remarked, this species ‘‘is found very abundantly in 
2? 
sandy coves around the Bay.’’ We found it even more abundant in 
the more or less muddy regions of the bay, principally in the upper, 
lower, and the eastern and upper portions of the middle bay as can 
readily be seen in a review of the tow-net hauls. These were all made 
with the same gear, at approximately the same depth and are therefore 
fairly comparable. From these hydrographic (tow-net) stations, fifty 
or more specimens were taken at fourteen (40%) of the upper bay 
stations; at nineteen (28%) of the lower bay stations; and at only 
six (18%) of the middle bay stations, all of which were in the upper 
and eastern portions, lying east of Alcatraz, and east and north of 
Angel Island. No specimens were taken in the tow-net outside. 
