256 University of California Publications in Zoology (VoL. 28 
KEY TO THE CALIFORNIA SPECIES OF PINNIXA 
I. Dactylus of third ambulatory leg strongly faleate, the corneous tip bent at an 
angle to the general outline of the segment. Females much larger and 
softer than the males. 
A. Merus of third ambulatory leg of male more than twice as long as wide. 
Fingers of female not gaping; immovable finger of male horizontal. 
Carapace oblong, about one and one-half times as wide as long. 
(Not known south of San Pedro.) 
faba, p. 259. 
B. Merus of third ambulatory leg of male twice as long as wide. Fingers 
of female gaping; immovable finger of male deflexed. Carapace 
pointed at sides, about twice as wide as long. 
littoralis, p. 260. 
II. Dactylus of third ambulatory leg straight or slightly curved, the corneous tip 
continuing the general line of the segment. 
A. Fourth ambulatory leg when extended not reaching end of merus of 
third ambulatory leg; third ambulatory leg enormously large in pro- 
portion to body. Carapace very wide, nearly three times as wide 
as long. 
1. Chela stout. Propodus of second ambulatory leg wide. (Not known 
south of Laguna. Beach.) 
longipes, p. 257. 
2. Chela feeble. Propodus of second ambulatory leg narrow. 
: tubicola, young, p. 265. 
B. Fourth ambulatory leg when extended reaching end or beyond end of 
merus of third leg. 
1. Propodus of third ambulatory leg about as wide as long. 
a. Carapace of female twice as wide as long. Propodus of last two 
legs squarish, much wider at distal end than proximal end 
of dactylus. Male not known. (Not known north of San 
Clemente Island.) 
tomentosa, p. 258. 
b. Carapace of female two and one-half times as wide as long; of 
male twice as wide as long. Propodus of last two legs taper- 
ing at distal end almost to width of proximal end of dactylus. 
tubicola, p. 265. 
2. Propodus of third leg distinctly longer than wide. 
a. Carapace very convex, sloping from the middle in all directions; 
slightly more than one and one-half times as wide as long. 
Chela with immovable finger, thumb, strap-shaped; hand much 
widened toward distal end; fingers with wide triangular gape. 
(Not known north of Venice, California.) 
barnharti, p. 261. 
b. Carapace more or less flattened, not sloping from the middle in 
all directions. Immovable finger not strap-shaped but dimin- 
ishing from base. 
i. Chela with immovable finger markedly deflexed. Carapace 
about twice as wide as long. 
occidentalis, p. 262. 
