PARASITIC COPEPOD CRUSTACEANS — LEWIS 99 



from both thii'd and genital segments, lyre-shaped although anterior 

 end with large, heavily sclerotized, knob-shaped anterior lateral pro- 

 jections. 



Genital segment (fig. 17c) barrel-shaped except for lappet-like lateral 

 posterior projections, anterolateral corners of segment forming small, 

 knoblike, heavily sclerotized projections. Fifth leg (fig. 17^) small, 

 slightly irregular, projecting from ventral lateral surface of genital 

 segment just posterior to middle of segment, bearing single, small, 

 spiniform projection and 3 plumose setules. Sixth leg (fig. 17e) 

 consisting of small, spiniform projection and single setule at posterior 

 end of oval irregularity of ventral genital segment sm'face in region 

 of genital opening. 



Abdomen (fig. 17c) 2-segmented, first segment subrectangular, 

 wider than long; second segment narrow anteriorly, flared to middle 

 of segment then cm-ved irregularly to anal concavity. Caudal rami 

 (fig. 17c) greatly enlarged, slightly shorter than genital segment, 

 excluding projections, laminate, with inner lateral margins plumose, 

 bearing 4 large, plumose setae from distal surface and 2 small setules, 

 one on each posterolateral surface. 



Antennule (fig. 18a) 2-segmented, attached to irregularity of an- 

 teroventral cephalothoracic surface and posteroventral surface of 

 frontal region. Both segments of general elongate natiu-e, first 

 approximately one and one-third times the length of second, flat- 

 tened ventrally, rounded dorsally, bearing approximately 22 plumose 

 and naked setules. Second segment rounded distally, with 6 small, 

 spinelike projections and 4 naked setules from distal surface, 1 naked 

 setule from distal dorsal surface. Antenna (fig. 186) 3-segmented, 

 situated medial and posterior to antennule base and lateral to oral 

 region. First segment flattened, proximal end abutting against small, 

 heavily sclerotized, padlike projection of cephalothorax. Third seg- 

 ment and terminal process fused, clawlike, with 2 setule-like acces- 

 sory processes, 1 medially, second proxtmaUy. Mandible (fig. 18c) 

 2-parted, proximal end articulating in circular depression in plate- 

 like region of heavy sclerotization; appendage rodlike, distal end 

 sharply rounded, distal inner surface denticulated. Postantennular 

 adhesion pad (fig. 18a) similar to that of Pandarus but not as well 

 developed, with kregular cross striations. Postoral process (fig. 18d) 

 irregularly lobate, tipped by spiniform process. Postoral adhesion 

 pads (fig. 18c) small, knob-shaped, situated slightly posterior to mouth 

 cone, at beginning of heavily sclerotized region forming articulation 

 surface for maxilla and maxilliped. Alaxilla (fig. 18c) 2-segmented, 

 first segment approximately one and one-thu'd times the length of 

 the second, with proximally projecting articulation surface (not 

 visible in figure) . Second segment narrower proximally than distally. 



