266 University of California Publications in Zoology [Vol. 23 



(not crested) transverse intumescence, from which the carapace curves sharply 

 downward toward the broad, slightly concave posterior margin; outer portion 

 of anterolateral margin defined by a ridge. Chelipeds rather small; hand oblong, 

 longer than the preceding joints combined, fingers hooked at the tips, their inner 

 margins meeting when closed; immovable finger not deflexed, but curved upward 

 distally; lower margin of palm convex. First pair of ambulatory legs slender 

 with slender dactyls about equaling propodi in length; second pair much longer 

 and stouter than first pair with relatively stouter dactyls, slightly shorter than 

 their propodi; third pair stouter and a little longer than the second and furnished 

 with shorter and stouter dactyls, dactyls markedly shorter than propodi, propodi 

 about as long as wide; fourth pair of ambulatory legs similar to but much 

 shorter than third, reaching, however, but not exceeding the end of the merus 

 of the third pair. 



Dimensions. — Type: length of carapace 4 mm., width 10 mm. 



Color, — Golden brown with spots of bluish gray on dorsal surface; much 

 lighter and of uniform color on ventral surface (Way). 



Type Locality. — Trinidad, Cape Mendocino, California. 



Distribution. — From Puget Sound to San Diego, California (Eathbun). 



Bemarks. — In calcareous tube of worm, Trinidad, California (Holmes), and in 

 tubes of Amphitrite (Way, from Eathbun). 



Pinnixa weymouthi Rathbun 



Plate 43, figures 9 and 10 



Pinnixa calif omiensis Weymouth, Stanford Univ. Publ., Univ. Ser., no. 4, 

 56, 1910 (part: young female from Pacific Grove). 



Pinnixa faba Weymouth, Stanford Univ. Publ., Univ. Ser.-, no. 4, 59, 

 fig. 7 (part: not synonymy). 



Pinnixa weymouthi Eathbun, Bull. U. S. Nat. Mus., 97, 166, text fig. 104, 

 pi. 36, figs. 9 and 10, 1918. 



Original Description of Male. — Carapace smooth; cardiac region a transverse 

 rounded elevation ; sides subtruncate, anterolateral angles rather prominent ; front 

 deflexed, advanced; anterolateral margin sharp, from hepatic region backward; 

 posterior margin little wider than base of abdomen. 



Chelae pubescent; upper and lower margins of manus convex; fingers sub- 

 conical, horizontal, curving toward each other near tips, edges sinuous, meeting, 

 tips crossing. 



[Ambulatory] legs pubescent, especially last two segments, propodi convex on 

 both margins; first leg narrow, propodus no longer than wide, daetylus long and 

 nearly straight ; second leg wider, but similar, reaching end of propodus of third 

 leg; third leg wide, daetylus slightly curved; fourth leg similar but smaller, 

 reaching middle of carpus of third. 



Abdomen with first segment very wide at base, its sides very oblique ; second 

 to sixth segment gradually diminishing, sixth constricted at middle; seventh short, 

 margin broadly rounded (Eathbun). 



Description of Female. — The female referred to here is about the same size as 

 the male but has a thin shell, so that its shape is not well defined. Front less 

 advanced and anterolateral margin less sharply marked than in male. Chelae not 

 pubescent outside, similar in shape to those of male, except that the thumb is a 

 little shorter. [Ambulatory] legs are as in male (Eathbun). 



Dimensions. — Type, male: length of carapace 3.3 mm.; width 5.3 mm. 



Type Locality. — Monterey Bay, California; 5 fathoms. 



Distribution. — Monterey Bay, California; beach to 5 fathoms (1 male, off 

 Monterey Wharf, 5 fathoms; 1 ovigerous female, Third Beach, Pacific Grove, 

 free on the beach) (Eathbun). 



