PART 1 GARTH : PACIFIC OXYRHYNCHA 107 



Chelipeds yellowish cream color and almost transparent. First two 

 ambulatory legs bright carmine, color fading towards dactyl; second 

 pair with a little carmine on merus only, other segments clear and 

 transparent. Visible dorsal portion of abdomen bright carmine; other 

 segments of abdomen banded with reddish brown. Pterygostomian region 

 dark red ; other areas of ventral surface clear creamy white. Eyes dark 

 olive buff. (Petersen, of a male from Santa Maria Bay, Lower Cali- 

 fornia) 



Habitat: Sand bottom in 47 per cent of the stations for which data 

 on bottom type are available, followed by rock and mud bottom, with 

 sand often secondarily present. Coralline, nullipore, and coral are also 

 represented in descending order of frequency. Crane (1937) noted 

 various types of bottom ranging from sandy and rocky to muddy, with 

 algae usually present. 



Depth: Shore to 55 fathoms, exceptionally to 80-90 fathoms, the 

 latter depth in the Gulf of California and off Magdalena Bay only. 



Breeding: Along the southern California coast, where collecting has 

 been carried on by the Velero HI in practically every month of the year, 

 the largest numbers of females with ova have been found in July, 

 August, and September. In the Gulf of California, where collecting by 

 Hancock expeditions has been restricted to the first quarter of the year, 

 gravid females have been found from late January to late March, but in 

 sparing numbers. 



Remarks: The first pair of legs alluded to by Lockington in the 

 original description are the chelipeds, while the second pair of legs 

 mentioned by him are the first pair referred to in the description above 

 and elsewhere in this paper. These Lockington described as more than 

 three times the length of the postrostral portion of the carapace. Ac- 

 cording to the measurements given, their length would be something 

 less than two and one-half times the total length of the carapace, in- 

 cluding the rostrum. This fact was apparently overlooked by Rathbun 

 (1925, p. 49), whose diagnosis of the species is therefore misleading. 



The description of Holmes, here given in preference to that of Rath- 

 bun because of Holmes's familiarity with Lockington's material, should 

 be supplemented slightly. The length of the rostrum, while variable 

 within the species, may be regarded for the purpose of comparison with 

 other species as approximately one-fourth the postrostral portion of the 

 carapace in the adult male. The male sternum is smooth in texture, the 

 sternal plates closely approximated, and there is a prominent pair of 

 setose tubercles opposite the coxae of the chelipeds. 



