PART 1 GARTH : PACIFIC OXYRHYNCHA 59 



triangular, almost equilateral, obliquely upturned. Eyes exceeding 

 postocular tooth by little more than length of cornea; stalks not taper- 

 ing. First movable segment of antenna very large, as wide as half the 

 rostrum, furnished on its anteroexternal margin with a row of long hairs. 



Chelipeds shorter than next leg, chelae tapering distally, fingers 

 narrowly gaping in proximal half. Ambulatory legs hairy; dactyli 

 strongly curved, terminating in long, pale, horny spines. (Rathbun, 

 1925, modified) 



Material examined: 9 specimens from 7 Hancock stations. (See 

 Table 4) From the south shore of Tiburon Island, Gulf of California, 

 Mexico, to La Libertad, Ecuador. Also one male from Askoy station 2, 

 Perlas Islands (Garth, 1948, p. 22), and one male paratype from Perlas 

 Islands, S. W. Garman (U.S.N.M. 55120). 



Measurements: Largest specimen, a male: length 12.6 mm, width 

 9.9 mm, rostrum 2.2 mm, cheliped 11.5 mm, chela 5.4 mm, dactyl 2.5 

 mm, ambulatory legs 12, 11, 9, and 7 mm, respectively. Female: length 

 7.1 mm, width 5.4 mm. 



Color in life: Carapace and ambulatories forest green above; manus 

 mottled forest green and greenish-yellow; dactyls white; under parts of 

 body entirely bluish-white striped transversely with broken lines of 

 purplish-blue ; underside of ambulatories forest green ; eggs orange. 

 (Crane) 



Habitat: Usually in tidepools, rarely under low-tide stones. Bits of 

 weed and sand grains attached to carapace and chelipeds of 16 specimens 

 found in a single small patch of fine green algae. (Crane) Hancock 

 specimens were all collected between tide levels and almost all are 

 covered with a minute, filamentous alga. 



Depth: Shore. 



Size and sex: Specimens range in size from young of 2.5 mm to the 

 12.6 mm male measured above, which is the largest specimen on record. 

 A 6.3 mm female carries ova. 



Breeding: Crane reports eggs from Costa Rica in February and 

 March. Velero HI collectors obtained a single ovigerous female from 

 Colombia in January, 1935. 



Remarks: Hancock expeditions specimens from Pond and Tiburon 

 Islands in the Gulf of California confirm the Albatross record from San 

 Francisquito Bay, Gulf coast of Lower California. This is not out of 

 keeping with what is known of distribution of tropical Pacific species, 

 since the Panamic fauna extends well within the Gulf of California. 

 However, the contemporaneous existence there of Eucinetops panamensis 



