NO. 1573. PARASITIC COPEPODS— WILSON. 339 



the terminal joint narrower and longer than the basal, and tipped 

 ^vith two claws, the shorter ventral one with a few coarse teeth on 

 the inner side at the base and a narrow-toothed flange along its outer 

 margin (fig. 9). The dorsal claw is narrower and longer and has a 

 narrow-toothed flange along either side. 



The second maxillipeds are two-jointed, as in the adult, but are 

 slender, with the terminal claw^ two-thirds the length of the basal 

 joint, strongly curved, and with a small accessory spine on the inner 

 margin near the tip. 



Fig. 10. The fiest three pairs of .swimming i.kgs of thk metanauplius of Nesippus alatus. 



There are three pairs of swimming legs, all biramose; the rami of 

 the first two paks are indistinctly two-jointed, while those of the 

 third pair are one-jointed (fig. 10). The basal joint of each ramus 

 has -a single spine at its distal corner, on the outside in the exopod, 

 on the inside in the endopod, while the terminal joint is ti])ped with 

 a row of large and nearly straight setae. 



This metanauplius is of a yellowish horn color, quite transparent 

 except through the center of the body. The pigment is scattering 



