264 University of California Publications in Zoology [Vol.23 



Pinnixa schmitti Rathbun 



Plate 42, figures 7, 8, and 9 



Pinnixa occidentalis Kathbun, H. A. E., 10, 187, 1904 (part: specimens 



from Cape Fox). 

 Pinnixa schmitti Bathbun, Bull. U. S. Nat. Mus., 97, 162, text fig. 101, 



pi. 35, figs. 6, 7 and 9, 1918. 



Fig. 157. Pinnixa schmitti, chela, d, XI (after Bathbun). 



Original Description of Female. — Like franciscana but carapace more oblong, 

 as sides are less pointed and anterolateral marginate crest is more prominent. 

 Cardiac 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. Belative 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 

 (Bathbun). 



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. 



Type Locality. — San Francisco Bay, California, 9% to 11 fathoms ("Alba- 

 tross" station D 5723). 



Distribution. — Port Levasheff, Unalaska, Alaska, to San Francisco Bay, Cali- 

 fornia; 7 to 80 fathoms (Bathbun). 



Bemarks. — 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) in the inequalities of the dorsal' surface of the carapace 

 (Bathbun). 



Biological Survey of San Francisco Bay. — This species was taken 

 only within the bay at five stations (D 5706, 5715, 5718, 5723, 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 like that 



