NO. 3656 COPEPODS—LEWIS 65 
MEASUREMENTS (in mm).—1 female and 1 male: 
female male 
Total length, excluding caudal seta 2.77 2.07 
Length of cephalothorax 1.55 e271 
Width of cephalothorax 1.53 i altZ 
Length of genital segment 0.65 0.40 
Width of genital segment 0.68 0.36 
Length of abdomen 0.34 0.32 
Description.—Female cephalothorax (fig. 26a) ovoid, consisting of 
cephalon, maxilliped bearing and first 3 pedigerous segments. Frontal 
region approximately one-seventh the total length of cephalothorax, 
with fine membrane along anterior edge. Lunules (fig. 26g) distinct, 
extending posteriorly, on ventral surface, past junction of frontal 
region and remaining cephalothorax. Lateral margin of cephalothorax 
flatly convex although slightly irregular, with slight indentation 
anteriorly. Lateral ventral surface bearing 2 narrow membranes, first 
extending laterally, second medially, on ventral surface. Small, cup- 
shaped depression present in dorsal posterior lateral surface, with 
single, hairlike process arising from middle of cup. Posterior sinus 
irregularly U-shaped, with membrane along outer lateral surface. 
Median posterior surface extending posteriorly slightly past lateral 
posterior surfaces, overlapping anterior end of free fourth pedigerous 
segment. Major dorsal cephalothoracic grooves forming irregular H, 
anterior legs terminating well posterior to ocular region. Ocular region 
distinct, in anterior third of cephalothorax. 
Female free fourth pedigerous segment short, length slightly more 
than half the width; segment widest medially, in region of fourth leg 
attachment. Segment distinct from genital segment ventrally, fused 
dorsally. Genital segment (fig. 26c) of general apple shape from 
dorsal viewpoint, anterior end narrowest. Fifth legs (fig. 28h) arising 
from posterior lateral surface, consisting of 2 setule-bearing nodules, 
anteriormost with single, lightly plumose setule, posterior with 3 
lightly plumose setules. 
Female abdomen 1-segmented, distinct from genital segment, 
lateral margins essentially parallel except at constricted anterior end; 
posterior surface angular, forming attachment surface for caudal 
rami, median posterior surface bilobed. Caudal rami (fig. 26f) con- 
stricted proximally, otherwise subrectangular, distal surface with 3 
plumose setae and 1 plumose setule, on inner edge, distal outer 
surface with 2 plumose setules; distal half of inner surface plumose. 
Male cephalothorax (fig. 26) and free fourth pedigerous segment 
similar to that of female. Genital segment (fig. 26d) of general barrel 
283-932—68——_5 
