NO. 3656 COPEPODS—-LEWIS 67 
2-segmented, distinct from genital segment dorsally, indistinctly 
separable ventrally. First segment short, slightly more than half the 
length of second, lateral margins flatly convex; second segment 
constricted anteriorly, margins parallel posterior to constriction, 
posterior surface angular, as in female. Caudal rami as in female. 
Female and male antennule (fig. 26g) 2-segmented, attached to both 
lateral ventral surface of frontal region and lateral anterior ventral 
surface of cephalothorax. First segment broad proximally, tapered to 
narrow distal end, anterior and ventral anterior surface with ap- 
proximately 20 naked and lightly plumose setae and setules. Second 
pp ed . Hee rt 
02 mm, & 0.2 mm. 9 0.2 mm. oe 
Ficure 27.—Caligus alaihi, new species, ventral views: a, female oral region, showing 
antenna, mouth cone, mandible, maxillule, maxilla base (ma-—2), postantennal, and 
postoral processes; b, male right antenna and postantennal process; c, right maxilla; 
d, male right maxilliped; e, female right maxilliped; f, sternal furca. 
