PARASITIC COPEPOD CRUSTACEANS — LEWIS 117 



Game Department from the nasal cavity of a specimen of Galeocerdo 

 cuvier taken by longline at Maalaea Bay, Maui, Hawaii. 



Measurements. — Twenty-four female specimens and four male 

 specimens : 



female male 



mean (mm. 



Greatest length, excluding setae 



Greatest length of cephalothorax 



Greatest width of cephalothorax 



Greatest length of genital 



segment 

 Greatest width of genital 



segment 

 Greatest length of abdomen 

 Length of egg strings 



(11 specimens) 17.79 10.71-24.50 



Diagnostic description. — Female cephalothorax (fig. 27a) con- 

 sisting of cephalic, maxilliped-bearing and first pedigerous segments, 

 frontal region narrow, projecting ventrally. Lateral cephalothoracic 

 margins strongly convex, posterolateral regions projecting posteriorly 

 and medially well past flatly convex posterior margin of median 

 cephalothoracic region to posterior end of fourth pedigerous segment. 

 Dorsal cephalothoracic grooves distinct, extending anteriorly from 

 junction of lateral and median cephalothoracic regions, terminating 

 in anterior region of cephalothorax, just posterior to grooves extending 

 posteromedially from indentation at junction of lateral cephalo- 

 thoracic margin and frontal region. Eyes distinct as 2 small, pig- 

 mented regions contiguous on median longitudinal axis of body, 

 between anterior terminations of major dorsal cephalothoracic grooves. 

 Male cephalothorax (fig. 276) consisting of cephalic, maxilliped-bearing 

 and fu-st pedigerous segments, frontal region narrow (as stated by 

 Wilson, 1907b, but not as figured), not directed ventrally as in female. 

 Lateral margins convex, posterolateral regions extending well past 

 posterior median cephalothoracic region to posterior region of third 

 pedigerous segment, with membrane along inner margin of extensions. 

 Dorsal cephalothoracic grooves and ocular region as in female. 



Second through fouth pedigerous segments of female (fig. 27a) free, 

 second broad, with winglike lateral extensions bearing large, oval pad 

 distally. Third pedigerous segment narrow, broader anteriorly than 

 posteriorly. Fourth pedigerous segment slender, with pair of small 

 alae laterally. Second through fourth pedigerous segments of male 

 (fig. 276) free, division between second and thii-d evidenced only by 

 indistinct line, second segment with small, lateral, membrane-margined 

 extensions similar to posterior extensions of lateral cephalothoracic 

 regions and, with anterolateral margin of thu'd pedigerous segment, 

 forming sinus. Fourth pedigerous segment broader than long, dis- 



