266 University of California Publications in Zoology [Vou 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.—tTrinidad, Cape Mendocino, California. 
Distribution—From Puget Sound to San Diego, California (Rathbun). 
Remarks.—In caleareous tube of worm, Trinidad, California (Holmes), and in 
tubes of Amphitrite (Way, from Rathbun). 
Pinnixa weymouthi Rathbun 
Plate 43, figures 9 and 10 
Pinnixa californiensis Weymouth, Stanford Univ. Publ., Univ. Ser., no. 4, 
56, 1910 (part: young female from Pacific Grove). 
Pinniza faba Weymouth, Stanford Univ. Publ., Univ. Ser., no. 4, 59, 
fig. 7 (part: not synonymy). 
Pinnixa weymouthi Rathbun, Bull. U. 8S. Nat. Mus., 97, 166, text fig. 104, 
pl. 36, figs. 9 and 10, 1918. 
Original Description of Male.—Carapace smooth; cardiac region a transverse 
rounded elevation; sides subtruneate, 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, dactylus long and 
nearly straight; second leg wider, but similar, reaching end of propodus of third 
leg; third leg wide, dactylus 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 (Rathbun). 
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 (Rathbun). 
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, Pacifie Grove, 
free on the beach) (Rathbun). 
