PART 1 GARTH : PACIFIC OXYRHYNCHA 83 



Bay, Lower Californian side of the Gulf of California, to Cape Cor- 

 rientes, Colombia. An additional 36 specimens from 5 Askoy Expedition 

 stations in southern Panama and Colombia. 



Measurements: The following figures are given in tabular form for 

 ease in comparing the largest male and largest female in the Hancock 

 collections, the former from Velero III station 941-39, the latter from 

 station 936-39: (Measurements in mm) 



Male Female 



Carapace 

 Length 

 Width 

 Rostrum 

 Length 

 Width 

 Cheliped 

 Chela 

 Dactyl 

 First walking leg 

 Second walking leg 

 Third walking leg 

 Fourth walking leg 

 It will be noted that the length and breadth of carapace, as well 

 as the length and width of the rostrum, are equal in both sexes. The 

 weakly developed cheliped of the female is readily apparent. The ap- 

 parent difference in descending order of leg lengths (3 . 2 . 4 . 1 in the 

 female and 2 . 3 . 4 . 1 in the male) is probably unimportant, as both 

 the measured male and the male neotype show asymmetry as regards 

 the relative length of legs 2 and 3. 



Color in life: Entire crab pinkish with olive-gray pubescence, except 

 for manus and dactyls of cheliped, which are pure white. Eggs coral- 

 red. (Crane) 



Habitat: With data on bottom type available from 30 stations, it 

 was found that mud bottom predominates over sand bottom in the 

 proportion of 60 to 40 per cent. However, sand was also a constituent 

 in over a third of the mud bottom stations. The Askoy found the species 

 occurring in gray or green sand or mud (Garth, 1948). Zaca expedition 

 specimens were found usually on mud bottoms, occasionally with sand 

 or rock, according to Crane (1937), who refers also to their sluggish 

 habit. 



