NO. 3574 COPEPOD CRUSTACEANS — LEWIS 105 



process on anterior dorsal surface. Posteriormost segment with 

 deep indentation in posterior half of lateral surface, indentations 

 forming articulation and attachment surfaces for caudal rami. 

 Caudal rami (fig. 37h) short, not extending past posterior end of 

 last abdominal segment, bearing 3 large, plumose setae from medial 

 posterior siu-face, 2 additional plumose setae from outer posterior 

 surface; sixth plumose seta present on inner posterior surface. 



Male cephalothorax and free fourth pedigerous segment (fig. 376) 

 similar to female. Genital segment (fig. 37^) suborbicidar, lateral 

 posterior siu-face indented, indentations bearing fifth legs. Fifth 

 leg (fig. 37 g) similar to that of female; sixth leg (fig. 37 g) arising medial 

 and slightly posterior to fifth, from broad, lappet-like pad, leg con- 

 sisting of single plumose seta and 2 plumose setules. Abdomen 

 distinct from genital segment, 2-segmented, first segment broader 

 anteriorly than posteriorly, second segment similar to posteriormost 

 segment of female. Caudal rami as in female. 



Female and male antennule (fig. 38a) 2-segmented, attached to 

 lateral-anterior ventral siu-face of cephalothorax, immediately 

 posterior to division between frontal region and remaining cepha- 

 lothorax. First segment more than twice the length of second, 

 with approximately 17 plumose setae and setules in addition to 2 

 knobs along distal half of anterior ventral surface; second segment 

 club shaped, with 1 plumose and 9 naked setae and setules in distal 

 region. Female antenna (fig. 386) 3-segmented, situated posterior 

 and slightly medial to antennule base. First segment short, irre- 

 gularly cup shaped, heavily sclerotized; second segment longer than 

 first, length approximately 1% times the width. Third segment 

 fused with clawlike terminal process, bearing knoblike accessory 

 process at indistinct break in sclerotization, in proximal third ; second 

 knoblike accessory processs at proximal end of segment. Male 

 antenna (fig. 38c) 3-segmented, first 2 segments basically similar 

 to those of female, third segment terminal process distinct from 

 segment, with second claw at proximal end of process. 



Female and male mandible (fig. 386) 4-parted, fourth part flattened, 

 with 12 denticulations along inner margin. Female and male post- 

 antennal process (fig. 386) consisting of 3 nodules, each with several 

 fine, hairlike processes. Female and male postoral process (fig. 386) 

 consisting of sub triangular, spinelike projection, bluntly pointed or 

 rounded distally. Female and male maxillule (fig. 386) nodular, bear- 

 ing 3 setae, situated in depression of platelike area of heavy sclerotiza- 

 tion between posterior margin of first segment of antenna and 

 subtriangular postoral process. Ovoid area of heavy sclerotization 

 present, extending posteriorly and medially between bases of maxillae, 

 with ridgelike projection along axis. Female and male maxilla (fig. 38 



