part 1 garth: pacific oxyrhyncha 157 



Localities subsequently reported, with collectors (excluding northern 

 records withdrawn as Chionoecetes angulatus in 1924) : Washington: 

 off Sea Lion Rock, 636 fathoms, and off Grays Harbor, 559 fathoms, 

 Albatross (Rathbun, 1925). 



California: 10 mi. from SE Farallon I., 700-820 fathoms, N. B. 

 Schofield (Goodwin, 1952a); Mulberry Seamount, 690-800 fathoms; 

 off San Francisco, 300 fathoms (Goodwin, 1952b) ; off Halfmoon Bay, 

 391 fathoms, off Pigeon Point, 5-296 fathoms, Monterey Bay, 198-1062 

 fathoms, Albatross (Rathbun, 1925) ; off Carmelo Bay, 659 fathoms, 

 off Point Sur, 328 and 475 fathoms, west of Piedras Blancas, 485 

 fathoms, and west of Point Buchon, 440 fathoms, Albatross (Rath- 

 bun, 1923b) ; off Point Conception, 284 fathoms, off San Miguel Is- 

 land, 264-271 fathoms, off Santa Cruz Island, 447-891 fathoms, off 

 Anacapa Island, 603 fathoms, off Santa Barbara Island, 302-638 fathoms, 

 and off Santa Catalina Island, 334-600 fathoms, Albatross (Rathbun, 

 1925) ; northwest of San Nicolas Island, 534 and 640 fathoms, and off 

 San Clemente Island, 414 fathoms, Albatross (Rathbun, 1923b) ; off 

 San Clemente Island, 464-776 fathoms, and off San Diego, 67-822 

 fathoms, Albatross (Rathbun, 1925). 



Lower California, Mexico: off Los Coronados Islands, 641-666 

 fathoms, and off Cortez Bank, 984 fathoms, Albatross (Rathbun, 1925). 



Atlantic analogue: None. An eastern Pacific north temperate species, 

 having as its western Pacific cognate Chionoecetes japonicus Rathbun 

 (1932, p. 32). 



Diagnosis: Carapace spinous, lateral margins partially concealed by 

 expanded branchial regions; space between branchial regions deep. 

 Rostrum inclined upward. Meri of ambulatory legs little dilated. Two 

 smaller subequal spines at curve made by the two dorsal branchial ridges. 

 Male first pleopod erect, tip acute, linear groove with a marginal row 

 of about 20 filaments; a comb of 9 filaments on opposite side. 



Description: Carapace much swollen at the branchial regions; 

 branchial regions distended both vertically and laterally, concealing the 

 lateral margin of the carapace. Between the branchial regions, which 

 nearly meet, a deep, narrow depression widening anteriorly and joining 

 the cervical suture. Carapace covered with spines and spinules instead 

 of tubercles and granules ; the transverse row across the branchial regions 

 more prominent than in Chionoecetes opilio, and well in advance of the 

 cardiac row; from its outer end a row of spines running obliquely for- 

 ward toward the orbit. Outer spine of the oblique branchial row as 

 large as outer spine of the transverse row, directly in front of it, and 



