NO. 1504. 



AMERICAN PARASITIC COPEPODS—WILSOX. 



689 



Flu. 7. — Second maxiluped of the metanau- 



PLIUS OF ALEBION GLABER. 



metanauplius stage, therefore, the two rami of the second maxillas are 



equally developed, and there is no indication of the subsequent dif- 

 ference between them. But we shall find a marked chanu-e in the 



chalimus stage. 



The first maxillipeds (tig, 0) are 



two-jointed with the joints about 



the same length. The basal joint, 



however, is stout, while the terminal 



one is slender and ends in two 



spines, the inner of which is twice 



the length of the outer. 



The inner spine is also slender 



and has a toothed membrane along 



both its inner and outer margins; 



the outer spine is triangular, 



strongly flattened, and toothed 



along the outer margin only. 



The second maxillipeds (fig. 7) have a very stout Imsal joint, while 



the terminal claw is slender, apparently three-jointed, and has an 



auxiliary spine on the inner mar- 

 gin of the second joint, this spine 

 being toothed. 



The swimming legs each consist 

 of a large disk-like basal joint and 

 two one- jointed rami bearing long 

 plumose setfe. 



There is a long slender spine at 

 the outer distal corner of the basal 

 joints in each pair. The exopods 

 of the first pair carr}^ three short 

 and stout spines along their outer 

 margins, while the exopods of the 

 second pair carr}^ onlv two (tig. 8). 

 The endopods of this latter pair, 

 however, carry a smaller spine on 

 their outer margin, while the 

 endopods of the first pair have no 

 spines. 



Each of these two pairs of legs 

 is connected across the mid line by 



a basilar chitin plate. The one connecting the first pair is transversely 



oblong with a small posterior margin, while that connecting the second 



pair is horseshoe-shaped and of aliout the same width and length (tig. 



9). The horseshoe opens toward the posterior end of the body and its 

 Proc. N. M. vol. xxxi— 06 45 



Fig. 8.- 



-The first swimming leg of the meta- 

 nauplius OF Ai.EBION GLABEK. 



