PART 1 



GARTH : PACIFIC OXYRHYNCHA 



33 



Chelipeds stout, especially in male; palms swollen, fingers nearly 

 horizontal, gaping slightly in basal half, prehensile margins denticulate r a 

 tooth on the dactyl within the gape. Legs slender, diminishing in length 

 from the first to the fourth pair, the longer pairs exceeding the chelipeds ; 

 dactyli flattened, not very slender, moderately curved. 



Abdomen of male constricted between the sixth and seventh seg- 

 ments, the seventh segment subtriangular. (Rathbun, 1925) 



Male first pleopod bent at an angle greater than 90° and in addition 

 spirally twisted. About two dozen short setae arranged in two or three 

 linear rows subterminally. Terminal aperture slightly eccentric. Bulbous 

 base excavated and grooved abdominally to receive the diminutive second 

 pleopod. [Compare Gordon's (1940) figures of Elamena species and of 

 Halicarcinus whitei (Miers).] 



TEXT FIGURES 



1. Halicarcinus planatus, 14.1 mm male (L.U.C.E. Sta. M 115). A. Pleopods 1 

 and 2 in situ, x 15. B. Tip of pleopod 1, x 85. 



