PARASITIC COPEPOD CRUSTACEANS — LEWIS 103 



110813) collected by the Hawaii Division of Fish and Game from the 

 external surface of a specimen of Carcharodon carcharias captured by 

 longline at Pokai Bay, Hawaii. 



Measurements. — Sixteen females, one male: 



female 

 mean (mm 



Greatest length, excluding setae 

 Greatest length of cephalothorax 

 Greatest width of cephalothorax, excluding 



flanges 

 Greatest length of genital segment 

 Greatest width of genital segment 

 Greatest length of abdomen 

 Approximate length of egg string (6 female 



specimens) 



Diagnostic description. — Female cephalothorax (fig. 20a) sub- 

 orbicular, consisting of cephalic, maxUliped-bearing and first pedigerous 

 segments; frontal region narrow, anterior margin irregular, anterior 

 lateral cephalothoracic margin with indistinct indentation. Mem- 

 brane-rimmed lateral cephalothoracic margins regular, with small but 

 distinct indentation medially that forms outer end of indistinct, 

 irregular groove extending laterally from posteromedial cephalo- 

 thoracic region. Lateral cephalothoracic regions extending poste- 

 riorly to anterior end of genital segment, weU posterior to median 

 cephalothoracic region. Posteromedian region with narrow, flange- 

 like extension dorsally, overlapping anterior half of narrow second 

 pedigerous segment. Dorsal cephalothoracic grooves distinct, major 

 pair extending anteriorly from junction of inner margin of lateral 

 cephalothoracic region and median cephalothoracic region to join 

 with groove extending posteriorly from indentation of anterolateral 

 cephalothoracic margin. Several minor grooves present although 

 most indistinct. Eyes distinct though smaU consisting of 2 pigmented 

 regions, contiguous on median longitudinal axis of body, and 2 minute, 

 circular lenses. Cephalothorax of male (fig. 206) similar to that of 

 female, major differences consisting of regular instead of UTegular 

 anterior margin of frontal region, 2 instead of 1 small indentation of 

 lateral cephalothoracic margin and with major dorsal cephalothoracic 

 grooves appearing to terminate before joining groove extending 

 posteriorly from indentation of anterolateral cephalothoracic margin. 



Female second through fourth pedigerous segments (fig. 20a) free, 

 second with 2-parted lateral extensions, anterior part heavily sclerot- 

 ized, rodhke except for adhesion pad formed by swoUen distal end; 

 posterior part of extension heavily sclerotized anteriorly, with mem- 

 branous margin posteriorly, both parts forming extension projecting 

 under lateral cephalothoracic region and under anterior end of fourth 



