NO. 3574 COPEPOD CRUSTACEANS — LEWIS 89 



segment without plates. Segment-like projection present between 

 fom'tli pedigerous and genital segTnents, separable from fourth pedig- 

 erous segment (at least superficially) both dorsaUy and ventrally, 

 distinct from genital segment; projection without processes. Genital 

 segment (fig. 31g) barrel shaped, fifth and sLxth legs (figs. 31^, h) 

 evident as series of plumose setules. Abdomen 1-segmented although 

 with annulations anteriorly. Caudal rami as in female. 



Female and male antennule (fig. 32c) 2-segmented, attached to 

 ventral surface of subtriangular projection from lateral anterior sur- 

 face of cephalothorax. Anterior and distal ventral surface of first 

 segment with 20 plumose setae and setules, median dorsal surface with 

 2. Distal-medial posterior surface of elongate second segment with 

 single naked setule, distal surface with 10. Female antenna (fig. 32c?) 

 3-segmented, situated posterior to subtriangular projection associ- 

 ated with antennule and frontal region. Fu-st segment short, irreg- 

 ular, attached to laterally extending, heavily sclerotized ridge. Third 

 segment fused with clawlike terminal process, bearing 2 setule-like 

 accessory processes. Male antenna (fig. 32e) 3-segmented, first seg- 

 ment originating on heavily sclerotized ridge, extending medially 

 and ventrally so that second segments of both antennae in close 

 proximity to each other. Second segment club shaped, with 1 large 

 and 1 small, spinelike projection on inner ventral surface. Third 

 segment short, distinct from long, saber-shaped terminal process, 

 shorter, spinelike sub terminal process and setule-like accessory 

 process. 



Female and male mandible (figs. ?,2d, e) 4-parted, rodlike, distal 

 part curving inward, inner surface with 12 denticulations. Female 

 and male postantennal process (figs. ?>2d, e) consisting of sharply 

 curved, spinelilce process, with outer margm denticidated distally, 

 in addition to 3 nodules, 2 on base of spinelike process, third posterior 

 to process, each with several hau'lil^e processes. Female postoral 

 process (fig. ?>2d) formed of heavily sclerotized plate bearing small 

 bifurcate projection, tines rounded distally. Male postoral process 

 (fig. 32e) small, lappet-lil<;e projection of heavily sclerotized ridge. 

 Female maxiUule (fig. 32(/) nodular, with 3 setules distally; male 

 maxillule (fig. 32e) nodular, with 1 long and 1 short setule distally. 

 Male oral region well anterior and congested, mouth cone located 

 between projecting fii'st segments of antennae; postoral process, 

 antenna base, mouth cone, maxillule, and maxilla in close proximity. 



Figure 33. — Lepeophtheirust fallolunulus , new species, ventral view: a, female sternal furca 

 (sf), tinelike projections, and base of first thoracic legs (ip = interpodal plate); b, male 

 sternal furca (sf), tinelike projections, and first thoracic legs (ip = interpodal plate). Right 

 thoracic legs: first, posterior view; d, second segment of exopodite of first, posterior view; 

 e, second, anterior view; f, third, anterior view; g, fourth, posterior view. 



