COPEPOD CRUSTACEANS — LEWIS 



127 



tral surface forming place of attachment of caudal rami, anal inden- 

 tation slight. Caudal rami (fig. 46e) narrower proximally than distal- 

 ly, distal half of inner siurface slightly swollen, swelling terminating 

 posteriorly in slight knob bearing plumose setule. Distal inner 

 margin plumose, distal surface with 3 plumose setae originating ventral 



Figure 47. — Caligus bonilo Wilson, 1905, female, ventral view: a, right side of frontal 

 region showing lunule and antennule base; b, left antennule; c, oral region, left side show- 

 ing antenna, postantennal process, mouth cone, mandible, maxillule, postoral process, 

 and maxilla base (ma-2); d, left maxilla; e, left maxilliped; f, sternal furca. 



to small median lobe, plumose setule present lateral to setae and 2 

 minute setules present, 1 on each side of ramus. 



Antennule (fig. 476) 2-segmented, attached to lateral-anterior 

 ventral surface of cephalothorax and lateral-posterior ventral surface 

 of frontal region. First segment slightly longer than second, proxi- 

 mal half broad, distal tapered to narrow distal end, anterior ventral 



