PARASITIC COPEPODS — WILSON 561 



size and well separated. The sucking disks are very large for so 

 small a copepod, between a third and a fourth of the carapace width 

 and so widely separated that their outer edges often appear outside 

 the edge of the carapace. The supporting rods in the margins of 

 the disks are made up of 18 segments regularly imbricated and 

 slightly tapered distally. The maxillipeds are slender, the end seg- 

 ment tipped with a finger process and a straight spine. The basal 

 plate is small and its posterior border is slightly bilobed, but without 

 teeth or any sort of projection. The first two pairs of legs have 

 no flagella and the basipod of the fourth leg has only a semicircular 

 lamella with no indications of a heel. In spite of the width of the 

 carapace all ihe legs project well bej'ond its lateral margins. Total 

 length, 2.3 to 3 mm. Carapace, 2 mm. long, 2.25 mm. wide. 



Male. — Carapace ovate, slightly wider than long and considerably 

 narrowed anteriorly, the cephalic area about as wide as long, the com- 

 pound eyes fully as far forward as in the female, the median eye quite 

 close behind them and fairly visible. The posterior lobes are very 

 broadly rounded and reach beyond the anterior margin of the fourth 

 segment and the posterior sinus is narrower than in the female, only 

 half as wide as deep. The fourth thoracic segment is half as long 

 and two-thirds as wide as the third segment with convex sides. The 

 abdomen is elliptical,, one-third longer than wide and more than half 

 as long as the carapace. The posterior sinus is about a fourth of the 

 entire length and the caudal rami are subbasal on lateral shoulders 

 near the base of the sinus. The testes are elongate elliptical, nar- 

 rowed posteriorly, and just reaching the base of the sinus. 



The first and second antennae are like those of the female, the 

 lateral claw on the second segment of the first antenna even weaker 

 than in the female. The supporting rods of the sucking disks have 

 one or two fewer segments and are just as fully imbricated, and the 

 disks themselves are fully as large. The maxillipeds are much 

 stouter and the segments are' shorter, the erd segment armed with 

 three curved claws and a lamella, which in turn is tipped with a small 

 curved claw. The basal plate has a smooth posterior margin with- 

 out spines or processes and without a boss on its ventral surface. 

 The only accessory sexual characters on the second, third, and fourth 

 legs are a swelling on the posterior margin of the third basipod and 

 a minute triangular process on the posterior margin of the fourth 

 basipod. Total length, 2.25 mm. Carapace, 1.43 mm. long, 1.50 mm. 

 wide. 



i?em«rA;5.— Meehean (1940, p. 468) said of this species: "The male 

 of A. lutus Smith * * * has never been reported because it is 

 indentical with funduU Kr0yer * * * so far as the available 



558871 — 44 3 



