PART 1 GARTH : PACIFIC OXYRHYNCHA 267 



Depth: 18-650 fathoms. (Rathbun) Depths over 300 fathoms are 

 from Monterey Bay south. Hancock specimens were obtained in depths 

 of from 35-380 fathoms. One shore record is believed to be in error, as 

 the species is not known to occur intertidally. 



Size and sex: In young Chorilia longipes turgida of from 5.0 to 10.0 

 mm the rostral horns are long and slender and occupy about one-third of 

 the carapace length. The width is slightly over half the length, giving 

 the young a more slender appearance than the adults. The postorbital 

 spine is slender, acute, inclined toward the horizontal, and well separated 

 from the preorbital, as in Rochinia, the cup-shaped postocular process of 

 the adult being assumed by a gradual curving around the eye, accom- 

 panied by a broadening of the spine in adolescent specimens. Sex may be 

 readily determined in 10 mm specimens, and females of 13 mm were 

 found to be ovigerous ; however, females of 33 and 54 mm produce a 

 vastly greater number of eggs. The tremendous development of the male 

 cheliped and the sharp crests of the palms occur in specimens approaching 

 the size of the 70.8 mm male measured above. 



Breeding: Ovigerous females were found by the Velero III in the 

 vicinity of the southern Channel Islands (Santa Catalina and San Cle- 

 mente) in September, November, and December, and by the Albatross 

 from Monterey Bay to San Diego, California, in March, April, and 

 May. (Rathbun, 1925) 



Remarks: In deeper dredging operations among the Channel Islands, 

 off the coast of southern California, the Velero III has amassed a series 

 of Chorilia longipes second only to that of the Albatross, and exceeding 

 that of the Albatross in representation of C. I. turgida, the southern form. 

 In enumerating specimens taken south of Monterey Bay, Rathbun (1925, 

 p. 207) mentions 2 males from off Santa Rosa Island, 2 males and 4 

 females from off San Miguel Island, and a few from among many speci- 

 mens taken off San Diego as being either typical of the northern form, 

 or intermediate between C. longipes and C. I. turgida. From among 

 Velero III collections, which are exclusively southern Californian, the 

 following localities yielded one or more specimens of the northern form : 

 off Redondo Beach, 70-240 fathoms ; south of Santa Barbara Island, 240- 

 275 fathoms; southeast of Santa Catalina Island, 132-148 fathoms; San 

 Pedro Channel, 12 miles southwest of Newport, 225-250 fathoms; east 

 of White Cove, Santa Catalina Island, 121-260 fathoms. Some or all of 

 these locations are subject to upwelling of cold water from greater depths. 

 A similar situation is found with respect to Scyra acutifrons, which also 

 presents a northern and a southern facies (see Remarks under that 

 species). 



