254 University of Califorma Publications in Zoology. [Vou. 23 
Pinnixa schmitti Rathbun 
Plate 42, figures 7, 8, and 9 
Pinniaa occidentalis Rathbun, H. A. E., 10, 187, 1904 (part: specimens 
from Cape Fox). 
Pinniza schmitti Rathbun, Bull. U. 8. Nat. Mus., 97, 162, text fig. 101, 
pl. 35, figs. 6, 7 and 9, 1918. 
Fig. 157. Pinniaa schmitti, chela, 3, X 7 (after Rathbun). 
Original Description of Female.—lLike franciscana but carapace more oblong, 
as sides are less pointed and anterolateral marginate crest is more prominent. 
Cardiae ridge obsolescent, broad and smoothly rounded; from a point behind 
each extremity, a smooth ridge curves forward to the anterior branchial angle, 
widening distally. Palm swollen, upper and lower margins convex, the latter 
becoming slightly concave under base of finger, which last inclines upward 
distally; outer and upper surfaces granulate, granules thinnest in middle, forming 
a line near lower edge, especially of finger, but very different from sharp, raised 
line in franciscana, prehensile edges of fingers meeting, sinuous. Relative lengths 
of [ambulatory] legs as much as in franciscana, but merus of third [ambulatory | 
leg less dilated, twice as long as wide, margins granulate, as also of the propodus 
(Rathbun). . 
Dimensions.—Type, female: length of carapace 5 mm., width 8.5 mm., length 
of third ambulatory leg about 9.7 mm. A male specimen: length of carapace 
5 mm., width 9.2 mm., length of third ambulatory leg about 10 mm. 
Typé Locality—San Francisco Bay, California, 944 to 11 fathoms (‘‘ Alba- 
tross’’ station D 5723). 
Distribution.—Port Levasheff, Unalaska, Alaska, to San Francisco Bay, Cali- 
fornia; 7 to 80 fathoms (Rathbun). 
Remarks.—In the fully developed male the chela is much higher in proportion 
to its length than in the female, its margins straighter, surface non-granulate, the 
thumb very short, the dactylus bent in an obliquely vertical direction, prehensile 
edges each obscurely bidentate. Abdomen suboblong, its sides slightly convex. 
There are males in which the chelae are similar to those of the female, that is, 
swollen, granulate, thumb only a little shorter than dactylus; they differ from 
those of the female in being more swollen and dactylus shorter. 
There is some variation (1) in the width of the legs, but as they are of the 
same general shape I am disposed to think that the specimens listed below are 
all of one species; (2) in the length and prominence of the granulate, antero- 
lateral ridge; (3) im the inequalities of the dorsal surface of the carapace 
(Rathbun). 
Biological Survey of San Francisco Bay.—This species was taken 
only within the bay at five stations (D 5706, 5715, 5718, 5728, 5825), 
having approximately the same range as those at which P. franciscana 
was taken: from off Point San Pedro in the upper bay, to off Mission 
Rock in the lower bay (see plate 9). Although only one specimen 
was taken at each station, the center of greatest abundance lke that 
