PART 1 GARTH : PACIFIC OXYRHYNCHA 225 



development of the carpal crest, the presence or absence of tubercles on 

 the carapace, and other minor characters of age or sex. (See also Remarks 

 below) 



Material examined: 173 specimens from 40 stations, divided as fol- 

 lows : ( See Table 43 ) 



U. S. National Museum material: 63 specimens from 15 stations, 

 all in Peru and Ecuador, collected by Waldo L. Schmitt. 



Hancock expeditions and related material: 111 specimens from 26 

 stations. From Santa Maria Bay, Lower California, and La Paz Bay, 

 Gulf of California, Mexico, to Vieja Island, Peru, including the Revilla 

 Gigedo Islands. In addition to the above, 38 specimens from 12 

 Galapagos Islands stations (Garth, 1946, p. 376). 



Measurements: Largest specimen, a male: length 34.6 mm, branchial 

 width 24.1 mm, hepatic width 20.3 mm, rostrum 4.4 mm, width 3.7 mm, 

 cheliped 34 mm, chela 19.2 mm, dactyl 10.2 mm, walking legs 44, 35, 29, 

 and 25 mm, respectively. Ovigerous female: length 22.7 mm, branchial 

 width 16.0 mm, hepatic width 15.0 mm. 



Color in life: Ranges from bright lettuce green through ochre and 

 brown to deep maroon, depending entirely upon color of surrounding 

 algae. (Crane, 1947, p. 71) 



Habitat : From seaweed. (Rathbun, 1910) From marine plant wash- 

 ings. (Garth, 1946) Rocky and sandy shore; coral flats. (Finnegan, 

 1931) Among elongate algae growing either in tidepools or, rarely, on 

 exposed, surf-beaten rocks. Also occasionally found below low-tide level. 

 (Crane, 1947) 



Depth: Specimens not obtained ashore were dredged in from 2 to 

 16 fathoms. 



Size and sex: Males of the U. S. National Museum series, men- 

 tioned above, range in size from 8 to 26 mm, females from 8 to 23 mm, 

 ovigerous females from 10.8 to 23 mm. A young specimen, probably 

 female, measures but 2.2 mm and is the smallest specimen examined. 

 It has large, sessile eyes and is constricted behind the hepatic lobes in 

 the manner of Pugettia. The two branchial lobes which serve to 

 distinguish the species, while very small, are clearly discernible. The 

 propodal flanges, which develop with age, are not apparent. Males in 

 the Hancock series range from 4.5 to 34.6 mm, females from 5.5 to 21 

 mm, ovigerous females from 11 to 21 mm. The specimen measured above 

 exceeds the 29.6 mm male reported by Miers (1877) and is considerably 

 larger than the 18.7 mm male specimen measured by Rathbun (1925, 

 p. 143). 



