66 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 125 
shape, fifth legs (fig. 28g) situated on posterior lateral surface, con- 
sisting of 2 setule-bearing nodules, anteriormost with single plumose 
setule, posterior with 2 plumose setules; sixth legs (fig. 289) situated 
on posterior surface, adjacent to junction of genital segment and 
abdomen, consisting of nodule bearing 3 plumose setules. Abdomen 
Ficure 26.—Caligus alaihi, new species, dorsal views: a, female; 6, male; ¢, posterior 
cephalothoracic sinus. Ventral views: c, female fourth pedigerous and genital segments; 
d, male fourth pedigerous, genital, and first abdominal segments; f, right caudal ramus; 
g, left lunule and antennule. 
