PART 1 GARTH : PACIFIC OXYRHYNCHA 261 



prominence on hepatic region. Front not strongly deflexed. Cheliped of 

 old male exceeding first walking leg. Apex of male first pleopod flaring, 

 tip undivided, rounded, and rimmed ; a papillate tongue process arising 

 from within opening. 



Description: Carapace rather narrowly triangular, somewhat flat- 

 tened, not nearly so wide and inflated as in the preceding species [Loxo- 

 rhynchus grandis]. Some of the tubercles much larger than others, the 

 principal ones being located as follows : a tubercle on the cardiac region 

 connected with a tubercle on the intestinal by a prominent ridge; two 

 tubercles on the branchial regions, the anterior somewhat nearer the 

 middle line ; a large tubercle on the hepatic region ; a tubercle on the 

 anterior and one on the posterior portion of the median region ; a tubercle 

 on either side of the anterior median tubercle; a row of small blunt 

 tubercles on the median region extending to each rostral horn. Rostrum 

 longer than broad, not so much depressed as in L. grandis, and having 

 more divergent horns, separated for more than half the length of the 

 rostrum. Preorbital spine prominent, subconical. 



Chelipeds rather slender; merus with three or four small tubercles 

 on the upper side; carpus with small tubercles; hand slender, slightly 

 wider at the base, margins rounded. Ambulatory legs rather short, the 

 first pair in the female usually longer than the chelipeds, merus grooved 

 above ; dactyls shorter and stouter than in Loxorhynchus grandis, about 

 one-half the length of the propodi. 



Abdomen of the male similar to that of the preceding species, but the 

 last [segment] narrower. 



The chelipeds in the male much longer than in the females, and in 

 old specimens becoming enormously lengthened. (Holmes) 



Material examined: 117 specimens from 57 stations. (See Table 52) 

 From Cordell Bank, southwest of Baker Head, northern California, to 

 south of Pyramid Cove, San Clemente Island, southern California. 



Measurements: Largest specimen, male: length 119 mm, width 88 

 mm, rostrum 19 mm, width 14 mm, cheliped 300 mm, merus 123 mm, 

 chela 135 mm, dactyl 52 mm, height of palm 30 mm, ambulatory legs ca. 

 207, 154, 132, and 103 mm, respectively. Female: length 105 mm, width 

 68 mm. 



Color in life: Bluish white, the rostrum, spines, and legs bright car- 

 mine. (Stimpson, 1857b) 



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

 rock. (Ricketts and Calvin) Generally found so thickly covered with 



