PART 1 GARTH : PACIFIC OXYRHYNCHA 209 



Mexico: West San Benito Island, Albatross (Rathbun, 1923b) ; 

 Natividad Island, A. W. Anthony (Rathbun, 1925); Ballenas Bay, 

 Albatross (Rathbun, 1898) ; Magdalena Bay, C. R. Orcutt (Rathbun, 

 1925). 



Atlantic analogue: None. A southern California-west coast of Lower 

 California endemic species. 



Diagnosis: No preorbital, but a small postorbital tooth. No supple- 

 mentary tooth on anterior margin between postorbital tooth and antero- 

 lateral angle. Propodites of ambulatory legs entire. Male first pleopod 

 flaring at apex ; pointed tip opposed by a slender, grooved projection. 



Description: Carapace ovate, convex anteroposteriorly and trans- 

 versely, smooth. No preocular tooth, postocular tooth small. Lateral 

 teeth small, subequal, blunt, the margins between them convergent an- 

 teriorly. Rostrum with strongly convergent sides, inclined downward, 

 flattened or slightly concave above, and with an equilaterally triangular 

 notch at the end. Antennae not reaching end of rostrum. 



Chelipeds of old male very stout, unarmed, subequal to first leg; 

 fingers gaping moderately for two-thirds of their length, a shallow lobe 

 on the dactyl at middle of gape, extremities of fingers crenate. Legs 

 stouter than in Pugettia producta. Fifth segment of male abdomen longer 

 than sixth. (Rathbun, 1925) 



Material examined: 62 specimens from 31 stations. (See Table 39) 

 From Venice Breakwater, California, to Entrada Point, outside Magda- 

 lena Bay, Lower California, Mexico, including Santa Catalina, Los 

 Coronados, Guadalupe, West San Benito, and Cedros Islands. 



Measurements: Largest specimen, a male: length 106 mm, branchial 

 width 92 mm, width between anterolateral teeth 60 mm, rostrum 13 

 mm, basal width 15 mm, cheliped 160 mm, chela 82.5 mm, dactyl 46 

 mm, height of palm 48 mm, ambulatory legs 150, 125, 105, and 92 mm, 

 respectively. Right cheliped (measured) larger than left. 



Color in life: Dark purplish, besprinkled with testaceous spots be- 

 coming large and somewhat ocellate behind, and still larger and brighter 

 on the under side of the body. (Randall) A specimen in the collection of 

 the Allan Hancock Foundation is labeled "deep purple." 



Habitat: Protected outer coast; rocky shores; low-tide horizon, pro- 

 tected rock and seaweed. (Ricketts and Calvin) Small specimens from 

 White Cove, Santa Catalina Island, stations 1370-41 and 1378-41, were 

 obtained from Eisenia holdfasts, along with numerous amphipods, iso- 

 pods, and polychaetes. 



