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PACIFIC SCIENCE, Vol. XVII, April 1963 
FIG. 15. Second antenna of developmental stages of dissimulatus. a, First nauplius, ventral view; h, second 
nauplius, ventral view; c, copepodite, posterior surface; d, setule of first segment of copepodite antenna (en- 
larged over original enlargement); e, first chalimus, posterior surface; f, second chalimus, posterior surface; 
g, third chalimus, posterior surface; h, fourth chalimus, posterior surface; i, fifth chalimus, posterior surface; 
j, male sixth chalimus, posterior surface; k, female sixth chalimus, posterior surface; l, male adult, posterior 
surface; m, female adult, posterior surface. 
surface. The third segment is slightly more than 
one-third the length of the second; it is slightly 
wider distally than proximally and possesses a 
spinelike projection on the anterior proximal 
surface that extends distally slightly past the 
end of the segment. Further, the third segment 
gives rise to a single lightly plumose seta from 
the inner lateral surface. The fourth segment is 
similar to the third although slightly smaller. 
The fifth segment is minute, its distal surface 
slightly irregular; the anterior lateral margin is 
longer than the posterior; a single lightly plu- 
