1921] Schmitt: The Marine Decapod Crustacea of California 263 
at depths between 83 and 68 fathoms. The bottom in all three cases 
was ‘‘very fine, green sand.’’ The range of temperature (bottom) 
9.3° to 9.8°C; range of salinity, 34.2 to 34.3. 
Pinnixa franciscana Rathbun 
Plate 42, figures 1, 2, 3, and 4 
Pinniza franciscana Rathbun, Bull. U. S. Nat. Mus., 97, 161, text fig. 100, 
pl. 35, figs. 1-4, 1918. 
Original Description of Female.—Near P. occidentalis, but carapace smoother, 
cardiac ridge blunt and straight. Propodus of cheliped small, upper edge convex, 
densely granulate, lower margin straight from near the wrist to end of finger; 
outer surface with a granulate ridge just above lower edge, continued to end 
of finger and fringed above with hair, also a line of granules through the 
middle, and two lines of punctae and hairs on upper half. Fingers wide, not 
gaping, tips crossing, a wide triangular tooth at middle of dactylus, a similar 
tooth on distal half of fixed finger. First [ambulatory] leg reaches nearly to 
middle of dactylus of second, second nearly to end of third, fourth to middle of 
carpus of third; merus of third leg one and two-thirds times as long as wide, 
distally narrow (Rathbun). . 
Dimensions.—Type, female: length of carapace 5.7 mm.; width 11 mm.; length 
of third leg about 12 mm. 
Type Locality—San Francisco Bay, California, 10 to 12% fathoms (‘‘ Alba- 
tross’’ station D 5709). 
Distribution—San Francisco Bay, California (see below, Biological Survey 
San Francisco Bay). 
Remarks.—Male differs from female in sharpness of cardiac ridge. Cardiac 
ridge in female may be somewhat sharp, as in female, station [D] 5743. The 
merus of second [ambulatory] leg is very slender in the young female and increases 
proportionally more rapidly in width than the body in size. Cheliped of male not 
known (Rathbun). 
Biological Survey of San Francisco Bay—Pinnixa franciscana 
has been found only in San Francisco Bay, where it was taken at 
seven of the dredging stations (D 5709, 5715, 5723, 5748, 5772, 5824, 
5825), from off Point San Pedro in the upper bay to off the Mission 
Rock in the lower bay, and ranging from 1144 to 1514 fathoms in 
depth (see plate 9). One specimen was taken at all but one station 
(D 5825), located about halfway between Angel Island and the 
Southampton Shoal Light, where six were obtained. The bottom 
in all cases was more or less sandy mud accompanied in at least two 
cases with numerous worm tubes, the probable habitat of this species. 
The lowest and highest annual mean temperatures and salinities for 
the stations at which P. franciscana was taken, given here in view of 
its apparently sedentary habits, range respectively from 12.0° to 13.3° 
C, and from 24.4 to 31.0. 
