PARASITIC COPEPOD CRUSTACEANS — LEWIS 119 



' tinctly separated from third pedigerous segment and genital segment. 

 Female genital segment (tig. 27c) large, appearing* swollen. Pos- 

 terior end of segment wider than anterior, lateral margins flatly 

 convex, posterior region bilobed, sinus between lobes narrow and 

 deep. Male genital segment (fig, 21d) narrower anteriorly than 

 posteriorly, lateral margins flatly convex, posterior with pah- of lobes, 

 just lateral to junction of abdomen and genital segment. Fifth legs 

 (fig. 21e) small, lobate projecting just anterior to genital segment 

 lobe, projection bearing triangular spinule and single, naked setule; 

 sixth legs not visible. 



I Female abdomen (fig. 27c) 1 -segmented, attached to ventral surface 

 of genital segment just anterior to apex of posterior sinus, covered by 

 genital segment lobes. Abdomen slightly widei anteriorly than pos- 

 teriorly, lateral margins flatly convex, posterior margin flat except 

 for anal indentation. Caudal rami lobate, projecting to posterior 

 end of genital segment, with 6 naked, spike-like setules from distal and 

 distal inner-lateral margin. Male abdomen (fig. 27 d) 1 -segmented, 

 distinctly divided from genital segment ventrally, indistinctly dorsally. 

 Segment widest medially, tapered anteriorly and posteriorly. Caudal 

 rami similar in shape to those of female, with 4 plumose setae on 

 medial distal surface, 1 naked setule at each lateral posterior corner. 

 Female and male antennule (figs. 28a-c) 2-segmented, situated on 

 lateral ventral cephalothoracic smiace, at division between frontal 

 region and cephalothorax. First segment almost twice the length of 

 second, broader distally than proximally, with approxunately 16 naked 

 or lightly plumose setules from distal thu'd of posterior and ventral 

 surfaces. Second segment club-shaped, with approximately 9 naked 

 setules distally, additional naked setule on distal posterolateral surface. 

 Female and male antenna (figs. 28a, 6, d) 3-segmented, attached 

 medial to antennule base. Fii'st segment slightly larger than second, 

 both irregidar in outline. Length of thhd segment and terminal 

 process slightly less than combined lengths of fu'st 2 segments, third 

 segment tapered to sharply rounded proximal end; division between 

 third segment and terminal process distinct, slightly moreso in male 

 than in female, terminal process strongly curved and clawlike. Two 

 setule-like accessory processes present, 1 from middle of segment 

 second from junction of segment and terminal process. 



Female and male mandible (figs. 28e, /) rodlike, curved inwards 

 very slightly distally, inner margin of distal region with approxi- 

 mately 12 denticidations. Immediately posterior and lateral to 

 antennule base of both male and female specimens is a single, spike- 

 shaped process comparable, in position only, to postantennular ad- 

 hesion pads of Pandarus and comparable, in shape only, to post- 

 antennal process of caligids. Female and male postoral process 



