PART 1 GARTH : PACIFIC OXYRHYNCHA 467 



Material examined: 54 specimens from 17 stations, including one 

 Askoy station. (See Table 103) From San Juanico Bay, Lower Cali- 

 fornia, and off Georges Island, Gulf of California, Mexico, to off 

 Esmeraldas, Ecuador. In addition to the above, 8 specimens from 5 

 Galapagos Islands stations (Garth, 1946). 



Measurements: Largest specimen, female: length 14.9 mm, width 

 19.6 mm, rostrum 0.2 mm, width 1.5 mm, cheliped 26.6 mm, merus 9.7 

 mm, manus 15.0 mm, dactylus 4.2 mm, height of palm 6.4 mm. Male 

 specimen: length 13.9 mm, width 18.3 mm, rostrum 0.3 mm, width 

 1.55 mm, cheliped 24.9 mm, merus 10.0 mm, manus 14.3 mm, dactylus 

 4.1 mm, height of palm 5.6 mm. 



Color in life: Ground color of carapace light ecru drab overcast with 

 light cameo brown, frontal areas and ridges darkest. Eyes speckled dark 

 green and gray. Chelipeds orange yellow with dentations dark red. 

 Ambulatory legs light cream color with touches of orange. Ventral side 

 white. (Petersen, of a specimen from Santa Maria Bay, Lower Cali- 

 fornia) See also Garth (1946, p. 414). 



Habitat: In 10 of 15 dredge stations the bottom was sand, with 

 rock, mud, or shell present in one haul each ; in 3 stations it was mud, 

 with shell present in one; in one station it was rock; in another it was 

 shell alone. 



Depth: 10-40 fathoms; exceptionally to 65 and 90 fathoms. 



Size and sex: Males are from 6.5 to 13.9 mm, females from 6.3 to 

 14.9 mm, ovigerous females 11.0 to 12.2 mm, young from 4.5 mm. 



Breeding: Ovigerous females were encountered off Lower California 

 in January, March, and May, and in the Gulf of California in March. 



Remarks: The species is definitely larger than Solenolambrus arcu- 

 atus, the species within its range with which it might most readily be 

 confused. There is a sharp spine at the base of the cheliped ventrally, 

 and a prominent sphere at the base of the dactyl of the manus. Young 

 specimens show a bent branchial ridge, high cardiac and gastric spines, 

 and denticulate margins and ridges. 



Genus AETHRA Leach 



Aethra Leach, in Latreille, 1816, p. 602. Rathbun, 1925, p. 550. 

 Oethra Lamarck, 1818, p. 264. Milne Edwards, 1834, p. 370. A. Milne 

 Edwards, 1878, p. 170. Alcock, 1895, p. 284. 

 Type: The Indo-Pacific Cancer scruposus Linnaeus, 1764, type of 

 Aethra Leach by monotypy. 



