PARASITIC COPEPOD CRUSTACEANS — LEWIS 85 



second, broad anteriorlj^, convexly rounded posteriorly. Second seg- 

 ment flared to V-shaped posterior end. Caudal rami laminate, in- 

 ner margin plumose, distal surface with 4 plumose setae and 2 minute 

 setules, 1 on each lateral edge of distal sm-face. 



Color of adult female, in alcohol, dark bro^vn or black over most 

 of dorsal cephalothoracic surface, dorsal plates, posterior end of 

 genital segment and anal lamina, light yellowish brown along margins 

 of body parts and caudal rami. Color of adult male, in alcohol, 

 brown or yellowish brown, without distinctive color pattern. 



Female antennide (fig. 11a) 2-segmented, attached to lateral ven- 

 tral surface of frontal region although appearing to articulate, at 

 least partially, in small depression on anterior ventral cephalothoracic 

 siu"face. First segment slightly more than three times the length 

 of second, mth 26 roughened setae on anterior ventral surface in 

 distal half of segment. Second segment slender, \vidth varying little 

 throughout length, distal siu-face rounded, with 6 short, naked setae 

 anteriorly, 2 short, naked setae medially and 2 posteriorly; additional 

 short, naked seta present on posterior lateral surface just proximal 

 to distal end. Male antennule (fig. 116) 2-segmented, first segment 

 approximately two and one-half times the length of second, distal 

 half \^'ith approximatelj^ 27 stiffly plumose setules on anterior ventral 

 and distal ventral sm-face. Second segment club-shaped, with ap- 

 proximately 9 naked setules on distal surface and 1 on distal posterior 

 surface. 



Female antenna (fig. lie) 3-segmented, situated medial and pos- 

 terior to antennule base. First segment irregular, outer lateral and 

 distal margins heavily sclerotized, distal forming articulation surface 

 for second segment. Second segment slightly longer than first, prox- 

 imal margin irregular, projecting anteriorly as lobate surface artic- 

 ulating in slight irregularity on inside of inner distal lateral surface 

 of first segment. Outer lateral margin ^vith large, knob-shaped 

 swelling, distal margin irregular, posterior portion projecting beyond 

 anterior. Length of third segment and terminal process similar to 

 that of second segment, proximal margin irregular, distal distinct 

 although appearing partially fused with clawHke terminal process. 

 Accessory processes consisting of small, knoblike structure on pos- 

 terior medial surface of segment and single, setiform process on dis- 

 tal inner surface at junction of segment and terminal process. The 

 antenna appears capable of being projected from or mthdrawTi into 

 the ventral cephalothoracic siu-face to some extent, the movement 

 being allowed by a rather flexible arthrodial membrane that, in the 

 fuUy extended appendage, appears segment-like. Large, obovate pad 

 attached to posterior surface of membrane, extending from cephalo- 

 thorax to middle of second antennal segment. Pad roughened, 



