PART 1 GARTH : PACIFIC OXYRHYNCHA 265 



Buchon, 440 fathoms, off Point Conception, 145 fathoms, and off San 

 Nicolas Island, 32-451 fathoms, Albatross (Rathbun, 1923b) ; off San 

 Miguel Island, 264-376 fathoms, off Anacapa Island, 388-603 fathoms, 

 and off Santa Barbara Island, 178-638 fathoms, Albatross (Rathbun, 

 1893a) ; off Santa Rosa Island, 243-265 fathoms, off Santa Cruz Island, 

 197-510 fathoms, and off Santa Catalina Island, 478-600 fathoms, Alba- 

 tross, and San Clemente Island, Scripps Institution (Rathbun, 1925) ; 

 northwest of San Clemente Island, 414 fathoms, Albatross (Rathbun, 

 1898) ; between Santa Catalina Island and San Diego, 464 fathoms, and 

 vicinity of San Diego, 36-650 fathoms, Albatross (Rathbun, 1893a). 



Fossil: ?California Pleistocene: Deadman Island, San Pedro (Rath- 

 bun, 1926). 



Atlantic analogue: None. A Pacific boreal species of which two geo- 

 graphical races, Chorilia longipes japonica (Miers, 1879a) and C. I. 

 turgida, are recognized as occurring in temperate waters of the western 

 and eastern Pacific, respectively. 



Diagnosis: Carapace multituberculate or spinate, largest spine on 

 branchial region ; a blunt ridge or, in Chorilia longipes turgida, a spine 

 on hepatic region. Rostral spines slender, subparallel or divaricate ; an 

 acute preorbital spine. Two spines on external margin of basal antennal 

 article. Cheliped of male massive; palm inflated and compressed, two 

 larger teeth in gape. Male first pleopod with two subterminal lobes, one 

 rounded, the other acute, opposing thickened but pointed tip. 



Description: Of typical Chorilia longipes'. Carapace covered with 

 numerous tubercles and some short, unequal spines; largest spine at 

 widest part of carapace on margin of branchial region. Other important 

 spines two median gastric, forming a rhomb with two smaller lateral 

 spines or tubercles. A blunt ridge or tubercle on hepatic region. Cardiac 

 region at its narrowest more than half its greatest width. Two median 

 cardiac tubercles, one larger intestinal tubercle. Rostrum about half (it 

 may be more or less than half) as long as remainder of carapace; horns 

 gradually tapering, acuminate. A slender preocular spine. Two spines on 

 outer margin of basal antennal segment, followed posteriorly by a trian- 

 gular tooth situated just outside the segment. Merus of outer maxillipeds 

 with concave surface and prominent outer angle ; ischium with a broad 

 and deep longitudinal sulcus. 



Chelipeds massive; merus prismatic, rough with granules, and with 

 tubercles and spines arranged in rows. Carpus similarly rough, inner 

 margin lamellate, the lamella bearing a backward-pointing lobe at proxi- 

 mal end. Manus compressed, upper edge thin. Fingers narrow, gaping in 



