NO. 3574 COPEPOD CRUSTACEANS — LEWIS 11 



Description of female. — Body (figs. 4a, b) of general taenia- 

 canthiform nature. Cephalothorax consisting of cephalon, maxilliped- 

 bearing, and first pedigerous segments; second througli fourth 

 pedigerous segments distinct. Frontal region (fig. 4e) narrow, un- 

 armed except for small, slightly projecting rostrum. Cephalothorax 

 projectmg ventrally well below ventral surface, extending posteriorly 

 over lateral anterior surface of second pedigerous segment, with 

 irregular, heavily sclerotized band across dorsal surface of posterior 

 region. Second, third, and fom*th pedigerous segments decreasing in 

 width, with ventraUy and posteriorly projecting extensions as on 

 cephalothorax except not as well developed. Fourth pedigerous 

 segment rounded posteriorly, extending over dorsal siu-face of fifth 

 pedigerous or first urosomal segment. Genital segment (fig. 4c) 

 indistinctly swollen, slightly larger than fifth pedigerous segment; 

 sixth legs present as pair of very lightly plumose setae and spinule- 

 like projection immediately posterior to oviducal openings. Abdomen 

 3-segmented, segments diminishing in length and width, from dorsal 

 viewpoint. Ventral surface of third abdominal segment with 2 rows 

 of minute spinules anteriorly, separated by pair of larger spinules 

 medially, and incomplete row of spinules in region of attachment of 

 caudal rami (fig. 4c). Caudal rami short, slightly longer than wide, 

 with 2 long, lightly plumose median setae, 2 short outer setae, and 1 

 inner setule on distal surface. 



Antennule (fig. 4/) 7-segmented although segmentation not com- 

 pletely distinct, first and second segments and third and fourth 

 segments appearing partially fused. First segment with 5 lightly 

 pkunose setae along anterior surface; second with 11 on anterior, 3 

 on dorsal surface ; third segment with 4 or 5 plumose setae anteriorly ; 

 fourth with 3; fifth with 4; sixth with 3 naked setules; seventh with 

 one naked setule from distal posterior sm-face, 3 small, naked setules 

 from posterior distal sm^face, 3 long, naked setules and one aes- 

 thete (?) from anterior distal surface. Antenna (figs. 4,ry, h) uniramous, 

 3-segmented; first segment tapered slightly toward distal end, with 

 slight knob on outer distal corner. Second segment slightly more 

 than half the length of first, with small spine on distal inner surface; 

 third segment IK times the length of second, with large, elongate 

 projection on inner surface, extending from distal end of segment 

 proximaUy, past proximal end to form cup-shaped projection over- 

 lapping distal half of second segment. Additional irregularly awl- 

 shaped projection present on distal ventral surface, projecting past 

 distal end of segment. Both projections with complete marginal 

 denticulations. Additional armature of third segment consisting of 

 3 naked setules and 4 clawlike spines distally. 



