258 University of California Publications in. Zoology [Vou 28 
shorter than the propodus; last pair of legs small and stout, scarcely reaching 
beyond middle of merus of preceding pair; dactyl stout, shorter than propodus. 
Dimensions.—Type: length of carapace 3.2 mm., width a little less than 6.3 
mm., width from claw to claw at fourth pair 19.1 mm. 
Type Locality——Tomales Bay, in tube of annelid. 
Distribution—Tomales Bay to Laguna Beach, California (Rathbun). 
Remarks.—The width of Tubicola longipes from end to end of the fourth pair 
of legs is eight [six?] times greater than its length from back to front (Lock- 
ington). There is probably no other crab of such great width relatively to its 
length, there is certainly no known species in which the fourth pair of ambulatory 
legs is so enormously enlarged, and I believe there is no Brachyuran which exceeds 
it in diminutiveness; commensal in the tube of an annelid worm, Clymenella 
(Holmes). This very odd looking little crab inhabits the sand tubes of Clymenella, 
which are abundant on the sand bars exposed at low tide near the outlet of Balboa 
Bay. One or two of the crabs were found in almost every tube examined which 
contained a worm (Nininger). 
Pinnixa tomentosa Lockington 
Pinnixza tomentosa Lockington, Proce. Calif. Acad. Sci. 7, 156 (12), 1876 
(1877) ; Holmes, Proce. Calif. Acad. Sci. (2), 4, 568, pl. 20, figs. 11-13, 
1894 (1895); Rathbun, Bull. U. 8. Nat. Mus., 97, 141, text figs. 85, 86, 
pl. 30, fig. 8, 1918. : 
a b c 
Fig. 153. Pinnixa tomentosa, 9, enlarged; a, third ambulatory leg; b, first 
ambulatory leg; c, chela (after Holmes). 
Characters—Female (from Rathbun): Carapace and legs covered with a 
short pubescence. Carapace nearly twice as wide as long, smooth, and rounding 
down to margins; a shallow depression behind gastric region; cardiac region 
swollen but not ridged. A transverse depression just behind margin of front; 
antero-lateral margin marked by a granulated line on the branchial region. 
Hand oblong, compressed, margins convex, the lower concave near the thumb. 
Fingers little over half length of palm, toothless; thumb wide, but abruptly 
narrowed near hooked tip; dactyl curved, subuncinate at apex, no longer than 
thumb. (Chela after Holmes.) 
First [ambulatory] leg much more slender and shorter than second; second leg 
nearly as long as third and less stout, its propodus tapering distally; first and 
second dactyls slender, slightly curved, third and fourth dactyls stout, short, and 
more curved but not hooked; third [ambulatory] leg very wide, merus a little 
more than one and one-half times as long as wide, propodus nearly square: fourth 
[ambulatory] leg similar in shape but much smaller. 
Dimensions.—Type, female: length of carapace 7.5 mm., width of same 14 mm. 
Type Localitya—Angeles Bay, Gulf of California. 
Distribution—San Clemente Island, California, to Angeles Bay, Gulf of Cali- 
fornia (Rathbun). 
