PARASITIC COPEPOD CRUSTACEANS — LEWIS 77 



Lateral abdominal margins convex anteriorly, concave posteriorly, 

 posterior margin biconvex. Caudal rami large, heavily sclerotized, 

 spiniform, arising from concave posterior lateral abdominal sm-face, 

 extending posteriorly and laterally; ramal sm^face of attachment 

 narrow. 



Cephalothorax dark brown to black dorsally except for posterolateral 

 corners, median portion of frontal region, pair of rounded areas in 

 ocular region and scattered, minute spots. Median plate of second 

 pedigerous segment with light brown pigmentation over most of 

 surface, lateral plates of segment dark brown to black except along 

 extremities. Median plate of third pedigerous segment with pair of 

 large, dark brown to black pigmented areas, one on either side of plate. 

 Foiu-th pedigerous segment dark brown to black except for margins 

 and for anterior siu"face, under plate of third pedigerous segment, in 

 addition to pair of small, orbicular areas at apex of indentation of 

 median posterior margin. Genital segment dark brown to black over 

 most of posterior half, anal lamina also dark brown to black except 

 along posterior margin. 



Antennule (figs. Id, 8a) 2-segmented, situated at lateral junction of 

 cephalothorax and frontal region. First segment approximately 3 

 times the length of second, broader proximally than distally, ventro- 

 anterior and anterior sm-face with 21 naked and lightly plumose 

 setules, ventrodistal surface with 7. Second segment club-shaped, 

 medial posterior siu"face with 1 naked setule, distal sm'face with 

 approximately 9. Antenna (fig. 86) 3-segmented, first segment with 

 closely associated, oval adhesion pad extending anteriorly and ven- 

 trally. Some indication present (grooves, lines of sclerotization) in- 

 dicating process may not be part of antenna although evidence indis- 

 tinct and contradictory evidence (continuation of heavily sclerotized 

 basal ridge with first segment, nature of the musculature) suggesting 

 that adhesion sm'face an extension of segment. First antennal seg- 

 ment, excluding adhesion pad, short, well developed, irregularly 

 tapered from proximal to distal end. Second segment sUghtly more 

 than four-fifths the length of fu'st, width slightly greater than length, 

 outer siu-face bilobed and compressed. Third segment less than half 

 the width of second, short, bearing hook-shaped terminal process, 

 distinct from segment, and 2 setiform accessory processes, 1 from 

 proximal posterior sm-face, second from distal inner sm'face, at junction 

 of segment and terminal process. 



Mandible (fig. 8c) 2-parted although indistinct evidence of division 

 in distal half of second part; distal region of second part flattened, 

 rounded distally, with 9 denticulations on inner surface. Postanten- 

 nular adhesion pad (figs. Id, 8a) large, oval, situated just posterior to 

 antennule base. Postoral process (figs. 8c, d) situated immediately 



