PART 1 GARTH : PACIFIC OXYRHYNCHA 343 



in two diagonal rows of three spines each, plus a single spine in advance 

 of either row. Median of three basal antennal spines double, giving a 

 four-spined appearance to anterior margin of article. Merus of third 

 maxilliped broader than ischium, notched to receive palpus; anteroex- 

 ternal angle broadly arcuate, anterointernal angle produced as a thin, 

 sharp blade, margins of both external and internal projections spinulous. 

 Female chelipeds with coxa, basis, and ischium of nearly normal size, 

 merus and carpus much reduced in diameter, propodus and dactylus 

 almost filiform. Sharp granulations of merus and carpus not extending 

 onto smooth or microscopically punctate manus. 



Female sternum with tubercles fewer in number than in male and 

 mostly concealed by rounded abdomen. Female abdomen seven-seg- 

 mented ; first segment with two tubercles side by side, second segment 

 with similar tubercles more closely approximated. 



Material examined: Manta, Ecuador, October 25, 1895, R. Paessler, 

 1 male specimen (Hamburg Museum). Sulphur Bay, Clarion Island, 

 Mexico, March 16, 1939, 48-60 fathoms, Velero III station 918-39, 

 1 female specimen. 



Measurements: Male specimen: length including rostrum 147 mm, 

 width including spines 145 mm, without spines 131 mm, rostrum 25 

 mm, width 25 mm, cheliped 230 mm, chela 105 mm, dactyl 41 mm, legs 

 271, 240, 219, and 190 mm, respectively. Female specimen: length in- 

 cluding rostrum 72 mm, width including spines 69 mm, without spines 

 60 mm, rostrum 10 mm, width 13 mm, cheliped 62 mm, chela 28 mm, 

 dactyl 11.4 mm, legs 82, 75, 71, and 60 mm, respectively. 

 Color in life: Unknown. 



Habitat: Black gravel, shell. (Rathbun) The Clarion Island speci- 

 men was dredged on a bottom of shell and coralline. 

 Depth: 48-182 fathoms. 



Remarks: The specimens recorded above are the first to be reported 

 since the holotype and extend the range of the species from the Bay of 

 Panama north to Clarion Island, outpost of the Revilla Gigedo Islands, 

 Mexico, and south to Manta, Ecuador. The discovery by Dr. A. Pan- 

 ning among Hamburg Museum collections of a large male incorrectly 

 identified as Maja squinado (Herbst) is most fortunate, since it permits 

 the figuring of the male first pleopod for the species and genus. Collected 

 by Captain Paessler in 1895, this specimen is almost as old as the holotype 

 in the Museum of Comparative Zoology, which now cannot be located, 

 according to Dr. E. Deichmann. 



