PARASITIC COPEPOD CRUSTACEANS — LEWIS 87 



presumably serving as adhesion pad. Male antenna (fig. lid) 3-seg- 

 mented, first segment irregular, with slightly ridged adhesion pad, 

 second segment rounded proximally, irregular distally, third segment 

 elongate, with strongly developed, heavily sclerotized, clawlike ter- 

 minal process in addition to 2 spikelike accessory processes. 



Female and male mandible (fig. 11^) indistinctly 3-parted, first 

 part short, approximately one-tenth the appendage length, second 

 part slightly less than three times the length of first, broader prox- 

 imally than distally. Third part longer than combined lengths of 

 preceding parts, tapered slightly towards angled distal region and 

 sharply rounded distal end. Angled distal region with 9 minute 

 denticulations on inner surface. Female postantennidar adhesion 

 pad extending posteriorly, from antennule base, past antenna. Male 

 postantennular adhesion pad (fig. 116) paddle-shaped extending lat- 

 erally from just posterior to antennule base. Female postoral proc- 

 ess (figs, lie, h) small, palplike, with heavily sclerotized, spike- 

 like terminal process and small, spikelike cuticular projection just 

 proximal to terminal process, on posterior surface, in addition to 

 3 minute, setule-like processes on indentation of medial anterior 

 surface. Both mandible and postoral process appearing attached to 

 same platelike area of heavy sclerotization. Postoral process of 

 male (figs. 11/, i) appearing 2-segmented, attached to platelike region 

 of heavy sclerotization on which mandible articulates, first segment 

 approximately 6 times the length of second, with 3 setule-like pro- 

 jections on outer distal sm-face; second segment with triangidar, heav- 

 ily sclerotized terminal process. Female with pair of oval adhesion 

 pads present posterior to mouth cone (fig. lie), extending posteriorly 

 on V-shaped region of heavy sclerotization connected to maxilliped 

 bases. Male with 2 slender, slightly ridged adhesion pads present 

 posterior to mouth cone base, between maxilla bases and on heav- 

 ily sclerotized area connected to maxilliped bases. 



Female maxilla (fig. llj) 2-segmented, first segment slightly more 

 than one and one-half times the length of second, well developed, 

 mth distinct knob-shaped projection of distal inner surface. Second 

 segment tipped by 2 saber-shaped processes and tuft of plumosities. 

 Male maxilla (fig. Ilk) 2-segmented, first segment slightly less than 

 one and one-half times the length of second, more strongly developed; 

 second segment with 1 plumose, knoblike projection and 2 lightly 

 plumose, seta-like terminal processes, outer almost twice the length of 

 inner. 



Female maxilliped (fig. 12a) 2-segmented, with broad base situated 

 just posterior and medial to maxilla base, along V-shaped region of 

 heavy sclerotization. First segment with heavily sclerotized proximal 

 projection serving as articulation and muscle attachment surface. 



