PART 1 GARTH : PACIFIC OXYRHYNCHA 203 



and lying in the same plane as the hepatic spine. Branchial spine directed 

 upward and forward. Rostral horns slender, divergent. A denticle on 

 outer margin of basal antennal article; three spinules on each pterygo- 

 stomian margin. Male manus rimmed ; cristae of manus and carpus less 

 pronounced than in Pugettia dalli. Male first pleopod similar to that of 

 P. dalli but with lateral projections not exceeding length of blunt tip. 



Description: Carapace somewhat depressed, a large tubercle on car- 

 diac and on each protogastric lobe, a smaller tubercle on intestinal, geni- 

 tal, anterior gastric, and on each branchial region ; tubercles clavately 

 setose. Clusters of curled setae on protogastric and lateral branchial re- 

 gions, a double row surmounting each rostral spine. Two lateral marginal 

 spines, one hepatic and one branchial. Hepatic spine slender, trending 

 basally in a transverse direction but curving forward until its tip is sub- 

 parallel with the long axis of the body. Branchial spine a little more 

 robust, tipped with a spinule also curving forward. Postorbital tooth 

 slender, thin, acute, tip bifurcate, directed forward and outward, and 

 lying in the same plane as hepatic tooth. Preorbital tooth long, slender, 

 and incurving. Rostral horns long, slender, divaricate, tips spinulous, in- 

 curving. Basal antennal article with an anteroexternal spine and a denti- 

 cle, rather than a lobe, on outer margin; flagellum long, slender, over- 

 reaching tip of rostrum. Pterygostomian region with three spinules. 

 Ischium of third maxilliped without a groove, merus produced at antero- 

 external angle; both segments broadened, as is the exognath. 



Cheliped of adult male massive ; merus with an inner crest and several 

 strong outer basal tubercles ; carpus with an inner and an outer crest and 

 two spinules in lieu of an intermediate crest; manus large, moderately 

 compressed, superiorly rimmed, rather than crested, the cristae being 

 noticeably thicker and less translucent than in Pugettia dalli; fingers 

 gaping narrowly, a tooth at base of dactyl and another more distally sit- 

 uated on pollex; pollex slightly deflexed, with tip upturned to meet down- 

 curving tip of dactyl. 



Ambulatory legs slender, first noticeably longer than second and ex- 

 ceeding cheliped in length ; third and fourth shorter and of a size ; legs 

 sparsely clothed with clavate setae. 



Female differing from the adult male as in the companion species, 

 Pugettia dalli] i. e., carapace broader and more ovate; gastric region 

 more swollen. Female abdomen subcircular in outline. 



Material examined: Besides the holotype, allotype, and two paratypes 

 from station 1922-49, an additional 40 specimens from 13 Guadalupe 

 Island localities were examined. (See Table 37) These range from 



