PART 1 GARTH : PACIFIC OXYRHYNCHA 205 



Description: Carapace lumpy, each lump or boss furnished with one 

 or more tubercles, as follows: four gastric, two of them median, two 

 lateral, a little behind the anterior median tubercle; one cardiac; three 

 intestinal, arranged transversely; four or five branchial. Lateral spines 

 three, one branchial, two hepatic; the branchial and the posterior of the 

 hepatic spines larger, curved, and with slender tips directed forward ; the 

 minor hepatic spine a little below the level of the major one and straight. 

 Postorbital spine isolated, a little behind the eye, slender. Supraocular 

 eave less expanded over the eye than in typical Pugettia. (Rathbun, 

 1924a) Preorbital spine also large, directed forward; the antennal spine 

 visible in front of it. 



Surface, except of fingers and distal portion of hand, covered with a 

 short, dense pubescence, with occasional tufts of longer, club-shaped 

 setae, most noticeable on the tubercles and other high portions of the 

 carapace and in submarginal rows on ambulatory legs; long, straight 

 hairs bordering the inner margins of the rostral horns, and curled hairs 

 forming an oblique row on each protogastric lobe. Rostrum deeply 

 divided by a wide sinus; outer margins of horns subparallel. Basal an- 

 tennal article having, besides the anteroexternal spine, one further back 

 on the outer margin, and, in the same line but behind the orbit, another 

 small spine. A small subhepatic spine ; also a row on the subbranchial and 

 on the pterygostomian region. 



Chelipeds of adult male about as long as carapace. Ischium spined on 

 inner margin ; merus on inner, upper and [outer] margins, four of the 

 upper spines being the longest of all ; the carpus with two spines on inner 

 margin, a row of four on outer margin, and a few spines above and 

 below; a few spinules on upper surface of palm at proximal end. Upper 

 and lower margins of palm slightly convex; dactylus nearly as long as 

 upper margin of palm ; fingers narrow, deflexed, toothed within, a very 

 narrow gape at base, with the teeth smaller there. 



Ambulatory legs subcylindrical, slender; propodites thickest at distal 

 end; dactyls with two rows of sharp, prehensile spinules, and a long, 

 light-horn-colored [amber] tip. (Rathbun, 1925, modified) 



Material examined: 62 specimens from 26 stations. (See Table 38) 

 From 5 miles off San Pedro breakwater, California, to 8 miles west of 

 Cedros Island, Lower California, Mexico, and including all eight of the 

 Channel Islands, Tanner Bank, Cortez Bank, and Guadalupe Island. 



Measurements: Largest specimen, an ovigerous female: length 23.9 

 mm, branchial width 17.3 mm, hepatic width, including spines, 13.5 



