PART 1 GARTH : PACIFIC OXYRHYNCHA 185 



Chelipeds of the male large, the merus rough and cristate on the 

 inner margin ; carpus with a lamina on the inner margin ; hand oblong, 

 the ringers bent downward and curved inward, somewhat gaping near 

 the base but distally dentate. In the females and young males the 

 chelipeds relatively smaller, the crista on the merus not so prominent, 

 and the fingers contiguous and dentate along the entire inner margin. 



First pair of ambulatory legs longer and a little more compressed 

 than the others, the penultimate article subcarinate above. 



Abdomen of female elliptical, seven- [segmented]. Abdomen of the 

 male widest at the third segment, narrowing rapidly to the fifth; fifth 

 segment about equal to the sixth ; last segment narrow and longer than 

 the preceeding one. (Holmes, modified) 



Material examined: A total of 115 specimens from 37 stations, in- 

 cluding 14 specimens from 4 Pacific Biological Station and 19 specimens 

 from 3 Hopkins Marine Station localities. (See Table 32) From 

 Esperanza Inlet, Vancouver Island, British Columbia, to Point Arguello, 

 California; Santa Rosa and Santa Cruz Islands. 



Measurements: Largest specimen, a female in the collection of the 

 Hopkins Marine Station: length 26.5 mm, branchial width 28.0 mm, 

 hepatic width 26.0 mm, rostrum 3.5 mm, width 4.0 mm, cheliped 41 mm, 

 chela 21 mm, dactyl 12 mm, height of palm 9.3 mm, ambulatory legs 

 40, 28, 25, and 18 mm, respectively. Male specimen: length 23.4 mm, 

 branchial width 26.1 mm, hepatic width 20.0 mm. 



Color in life: Dull purplish; legs crossed by light bands. (Holmes) 

 Tan or light reddish with the lateral expansions and marks on the 

 cardiac region lighter, in some cases almost white. (Weymouth) Red 

 or red-brown, with a white V on the carapace and white striped legs. 

 (Hart) 



Habitat: Found alongshore with Pugettia richi; also dredged from 

 moderate depths. (Weymouth) Among rocks at low tide. (Johnson and 

 Snook) Protected outer coast; rocky shores; low tide horizon, under 

 rock. (Ricketts and Calvin) A 7.2 mm specimen from off Santa Rosa 

 Island, California, station 1282-41, was covered with an encrusting 

 bryozoan identified by R. C. Osburn as Hippothoa hyalina (L.). 



Depth: Intertidal to 23 fathoms; to 70 fathoms, G. E. MacGinitie, 

 collector, specimen in Hopkins Marine Station collection. 



Size and sex: The Hancock series contains males from 7.2 to 23.4 

 mm, and females from 7.7 to 19.3 mm, ovigerous females 12.4 to 19.3 

 mm. A 19 mm male from Coos County, Oregon, has a much less crested 

 manus than males of comparable size from south central California. 



