PART 1 GARTH : PACIFIC OXYRHYNCHA 359 



height; sometimes also a granule adjacent in the same horizontal line. 

 Legs stout ; merus armed above with seven or eight spines in two rows 

 and at the distal end a single spine between those rows, below one or 

 two small spines; four or five spines on carpus; propodus unarmed. 

 (Rathbun, modified to eliminate comparative references to Mithrax 

 (Mithrax) hemphilli) 



Material examined: Six specimens from 3 stations. (See Table 72) 

 From Los Frailes, peninsular side of the Gulf of California, to Salinas 

 Bay, Costa Rica, and including topotypical material from Mazatlan, 

 Mexico. 



Measurements: Comparative dimensions of a male and female from 

 the type locality, in all probability a mated pair, are given in tabular 

 form: (Measurements in mm) 



Carapace length 



Carapace width including spines 



Carapace width excluding spines 



Rostral length 



Rostral width 



Cheliped 



Chela 



Dactyl 



Height of palm 

 First ambulatory leg 

 Second 

 Third 

 Fourth 



Color in life: Clinging to ochre weed, matching it perfectly in color. 

 (Crane) Color in preservative: Crimson, mixed with white; outer sur- 

 face of chelipeds crimson with small white dots; abdomen crimson and 

 white, mottled. (Rathbun) 



Habitat: In tidepools. (Crane) The Mazatlan specimens were col- 

 lected from a harbor jetty, the Los Frailes specimens from an exposed 

 reef. 



Depth: Intertidal. 



Size and sex: The small series contains young of 11.4 and 15.9 mm, 

 males of 38 and 53.7 mm, and an ovigerous female of 56 mm. 



Breeding: The single ovigerous female was collected at Mazatlan in 

 December. 



