NO. 1504. 



A ME RICA N PA EA SITIC CO PEPODS— WILSON. 



693 



The second maxilla? are simple and made up of a stout e\' lindrical 

 base, abruptl}' rounded and tipped with a short triangular spine 

 (tig". 12). This represents the endopod of these maxilla; as seen in 

 the metanauplius stage; the exopod has even thus early degenerated 

 into the form seen in the adult, a papilla fused with the base of the 

 endopod and carrying two small spines. 



The mouth tube is cylindrical and nearly as wide at the tip as at the 

 base; the mouth opening is sul)terminal (a little ventral), and heavily 

 fringed with hair<. When viewed from the ventral surface the tips 

 of the mandibles can be seen inside the oyjening. The}^ are slender 

 and two-jointed, the terminal joint only one-eighth as long as the 



Fig. l'.i.— The mouth-tube, m.\ndibles, .\nd second 



MA.XILLAE OF A MALE CHALIMUS OF ALEBIOX 

 GLABER. 



Fig. 13.— The fiest and second maxilli- 



PEDS OF A CHALIMUS OF ALEBION GLABER. 



basal and minutely toothed along its inner margin, the number of 

 teeth being eighteen or twentv. 



The tirst maxillipeds (tig. 13) are similar to those in the adult, the 

 two joints about the same length,. but the basal joint considerably the 

 stouter. Both the terminal claws have a toothed membrane along 

 their inner and outer margins. 



The second maxillipeds are short and stout; the basal joint is nearly 

 as wide as long, and is tilled with strong muscles; the terminal claw is 

 stout at the base Ixit tapers to a weak tip, not much longer than the 

 accessory spine and only slightly curved. 



All three pairs of swimming legs (tig. U) are biramose and the rami 

 are one-jointed. In the tirst pair the exopod is as long as the basal 



