1921] Schmitt: The Marine Decapod Crustacea of California 259 

 Pinnixa faba (Dana) 



Plate 40, figures 1, 2, 3, and 4 



Pinnotheres faba Dana, Proe. Acad. Nat. Sci. Phila., 5, 253, 1851 ; Crust. 

 U. S. Expl. Exped., 1, 381, 1852, pi. 24, fig. 4, 1855. 



Pinnixa faba Holmes, Occas. Papers Calif. Acad. Sci., 7, 93, 1900; Bath- 

 bun, H. A. E., 10, 188, 1904; Weymouth, Stanford Univ. Publ., Univ. 

 Ser., no. 4, 59, text fig. 7, 1910 (part: specimen from Monterey Bay) ; 

 Bathbun, Bull. U. S. Nat. Mus., 97, 142, text figs, 27, 88, pi. 31, figs. 1-4, 

 1918. 



Fig. 154. Pinnixa faba, X 6; a, right chela of J 1 ; b, left chela of J (after 

 Bathbun). 



Characters.- — Carapace about one and a half times as wide as long, oblong, 

 strongly convex, both longitudinally and transversely, truncated at the sides. In 

 some males the anterolateral angle is vertically compressed and correspondingly 

 thin, forming a laterally projecting lobe; no transverse ridge behind the gastric 

 area; anterolateral margins marked by a low ridge, which disappears near the 

 orbits; orbits oval. Hands of chelipeds flattened, widest just behind the articu- 

 lation of dactyl ; more or less pubescent on inner side between the fingers ; fingers 

 of female not gaping; immovable finger of male horizontal. Merus of third 

 pair of ambulatory legs of male more than twice as long as wide. 



Dimensions. — Type, female: length of carapace 11.7 mm., width 17 mm. 



Color. — Dark or light brown, or brownish red, with hand coarsely dotted with 

 color (Dana). Specimens in formalin: General color of females orange rufous 

 with patches of scarlet on the gastric regions. Eggs orange chrome. Male, 

 orange rufous, or dirty greenish-white, with orange rufous spots on carapace and 

 a few of the same on chelipeds and legs. One female from Taylor Bay, British 

 Columbia, was entirely white in life (Bathbun). 



Type locality. — Puget Sound. 



Distribution. — From Prince of Wales Island, Alaska, to Humboldt Bay, Cali- 

 fornia (Bathbun). San Pedro, California (Holmes). 



Remarks. — Commensal in bivalve mollusks: Sohisothaerus, Saxidomus, Mya, 

 Paphia (Bathbun) ; and cloaca of large holothurian, Molpadia (Holmes). Miss 

 Bathbun, however, thinks Holmes's specimen may have been P. barnharti. 



