PART 1 GARTH : PACIFIC OXYRHYNCHA 365 



margins slightly arcuate, or subtruncate, sinus V-shaped. Orbits with a 

 minute preocular tooth and two small teeth above, one at outer angle 

 and one below. Eyes large, prominent. Basal article of antennae very 

 broad, with two marginal teeth ; movable portion cylindrical, nearly half 

 as long as body. [Maxillipeds with the ischium subquadrate, the merus 

 emarginate at anterointernal angle.] 



Chelipeds nearly twice as long as carapace; arm and wrist with a 

 few minute tubercles ; hand robust, smooth ; dactylus with a large tuber- 

 cle in the middle of the gape. Legs slender, shorter than cheliped, having 

 a few spinules on merus and carpus, propodus smooth. (Rathbun, after 

 Bell) 



As shown by a total of 66 specimens examined, the minute preocular 

 tooth may be entirely wanting, and the walking legs are generally more 

 spinulous than described, rather than less. Bell's figures, referred to by 

 Rathbun (1925) in connection with the outer maxilliped, are not too 

 reliable. 



Material examined: 44 specimens from 15 Velero III stations. (See 

 Table 75) From Isabel Island, Nayarit, Mexico, to La Plata Island, 

 Ecuador, including Socorro Island of the Revilla Gigedo Islands. In 

 addition to the above, 22 specimens from 5 Askoy expedition stations 

 (Garth, 1948), plus two from one Hamburg Museum station. 



Measurements: Largest specimen, male: length 10.3 mm, width 

 including spines 12.0 mm, without spines 11.4 mm, rostrum 0.5 mm, 

 width 2.0 mm, cheliped 25.3 mm, chela 13.5 mm, dactyl 5.0 mm, height 

 of palm 3.0 mm, ambulatory legs 17.4, 15.0, 13.6, and 9.7 mm, respec- 

 tively. Ovigerous female: length 8.4 mm, width including spines 9.3 

 mm, cheliped 11.5 mm. 



Color: Pale brownish above, reddish beneath; hands a red brown. 

 (Bell) 



Habitat : Sand. (Bell) Shore pools, corals. (Finnegan) In Pocillopora 

 coral. (Crane) Velero III specimens were cracked from Pocillopora 

 coral in 6 instances, dredged from among nullipores in 6 more, and 

 taken on bottoms of shell, sandy mud, and coralline once each. 

 Depth: Low tide level to 25 fathoms. 



Size and sex: In the present series young range upward from 2.0 

 mm, males from 6.3 to 10.3 mm, females from 4.8 to 8.4 mm, ovigerous 

 females from 5.2 to 8.4 mm. A 6.4 mm male has a well-developed cheli- 

 ped. 



Breeding: The large number of ovigerous females encountered at 

 Taboga Island in May (12 out of 12) indicates a breeding cycle cul- 

 minating in early summer. 



