PART 1 garth: pacific oxyrhyncha 215 



Diagnosis: A preorbital, but no postorbital tooth. A supplementary 

 tooth on anterior margin between orbit and anterolateral angle. Three 

 lateral teeth; margin of carapace strongly rimmed. Inferior distal tooth 

 of propodites of ambulatory legs stout. Apex of male first pleopod not 

 flaring widely, tip coarse and blunted, two opposing lobes reduced to 

 folds curling outward ; tonguelike projection within orifice lacking, but 

 supporting median projection remaining. (See also Remarks below) 



Description: Carapace very convex, suborbicular, save for the flat, 

 deflexed rostrum, smooth ; lateral border marginate, two teeth anteriorly, 

 an obscure tooth at widest part of carapace and a trace of another behind 

 it. Rostrum subtriangular, tip bifurcate; preorbital tooth present. Eye- 

 stalks globular, sunk in the circular orbits. Chelipeds elongate, very strong 

 in male, two tubercles on upper edge of arm, one tooth at anterointernal 

 angle of wrist, fingers long, gaping. Legs diminishing rapidly in length 

 from first to fourth, a setiferous tooth on under side of propodites in- 

 creasing in the same order; dactyli bluntly spinulous beneath. (Rathbun, 

 1910) 



Material examined: 8 specimens from 5 stations. (See Table 41) 

 From North Chincha Island, Peru, to Montemar, N of Valparaiso, 

 Chile. 



Measurements: Largest specimen, a Lund University Chile Expedi- 

 tion male: length 87 mm, branchial width 68 mm, hepatic width 48 

 mm, rostrum 10 mm, basal width 11 mm, cheliped 100 mm, chela 45 

 mm, ambulatory legs 113, 85, 68, and 55 mm, respectively. The follow- 

 ing measurements of a male and ovigerous female of approximately equal 

 size are given in tabular form for purposes of comparison. Neither is as 

 large as the 100x80.4 mm male recorded by Rathbun (1925). (Meas- 

 urements in mm.) 



