1921] Schndtt : The Marine Decapod Crustacea of California 261 



Biological Survey of San Francisco Bay. — Pinnixa littoralis is 

 represented in the collection by a single immature female specimen 

 taken from a clam dredged at D 5709 (middle bay) in 10 to 12y 2 

 fathoms on "muddy sand." For this station the annual mean tem- 

 perature is 13.05° C with an annual range of 7.8° to 18.0° C ; the 

 mean salinity 24.39, range 15.2 to 30.1. One specimen of Pinnixa 

 franciscana was also taken at this station. 



Pinnixa barnharti Rathbun 



Plate 41 



Pinnixa tumida Streets, Bull. U. S. Nat. Mus., 7, 115, 1877; not P. tumida 



Stimpson, 1858. 

 Pinnixa faba Eathbun, H. A. E., 10, 188, 1904 (part: specimen from San 



Pedro). 

 Pinnixa barnharti Eathbun, Bull. U. S. Nat. Mus., 97, 149, text fig. 91, 

 pi. 32, 1918. 



Original Description of Female. — Carapace hexagonal, very convex in both 

 directions, sides truncate, antero-lateral margin a line of very fine granules not 

 continued to hepatic region, side walls vertical, subhepatic region prominent, sur- 

 face coarsely punctate toward the sides, furrow behind gastric region shallow, 

 three deep pits on each side anteriorly, posterior margin very concave. Lobes 

 of front prominent and arcuate, viewed from above. Orbits broadly oval, filled 

 by the eyes. Antenna as long as width of front and one orbit. 



Chelipeds large; chelae rhomboidal, increasing greatly toward fingers, a sinus 

 in lower margin near base of thumb; thumb subhorizontal, a little curved or 

 convex beneath, of nearly equal width throughout, tip obliquely truncate, lower 

 corner armed with a short, sharp tooth, which is crossed by the sharp tip of the 

 dactylus; dactylus oblique, making a large triangular gape with the thumb; a 

 strong tooth at middle of dactylus, a fringe of hair above; a patch of long hair 

 in the gape. 



Merus of cheliped and [ambulatory] legs hairy above; merus and propodus 

 of last two legs hairy below, carpus and propodus of last leg hairy above. 

 [Ambulatory] legs thick, first nearly as long as second, but narrower, second 

 reaching to dactylus of third, fourth to middle of carpus of third; merus of last 

 3 legs convex above, propodus of all tapering, dactylus short, nearly straight, 

 broad at base, acuminate. (Eathbun.) 



Dimensions. — Type, female: length of carapace 10.7 mm., width 16.2 mm. 



Color. — The carapace in alcohol is largely a bluish purple; a few patches of 

 same color on chelipeds and first three legs (Eathbun). 



Type Locality. — Venice, California; from cloaca of "sea cucumber" (holo- 

 thurian). 



Distribution. — From Venice, California, to Ballenas Bay, Lower California 

 (Eathbun). 



Remarks. — "Chela of male very like that of female except palm a little 

 shorter; in small but mature female, palm is still shorter. ... Commensal with 

 holothurians, Molpadia" (Eathbun). 



