PARASITIC COPEPODS — WILSON 535 



LEPEOPHTHEIRUS EMINENSr new species 



Plate 28, Figures 132-138 ; Plate 29, Figure 149 



Seven females and 14 males were taken from the outside surface of 

 a black marlin {Mahaira ampla marlina) captured at Ventura Bay on 

 the coast of Baja California. The female holotype and male allotype 

 are U.S.N.M. No. 79636. 



Female. — Carapace elliptical, narrowed a little anteriorly and wid- 

 ened posteriorly, the anterior margin evenly rounded, with a well- 

 defined sinus at the center. Median posterior lobe half the width of 

 the carapace and extending slightly back of the lateral lobes, the latter 

 broad and evenly rounded. Free segment less than a third as wide as 

 the carapace with strongly convex lateral margins. Urosome a little 

 more than half as long as the metasome; genital segment wider than 

 long and half as wide as the carapace, with parallel sides and rounded 

 lobes at its posterior corners. Abdomen longer than the genital seg- 

 ment and two-fifths as wide, made up of two segments, which are 

 more or less fused with each other and with the caudal rami. The 

 latter are nearly as wide as long and each is armed with five setae, the 

 middle one the longest. 



Antennae and mouth parts of the usual type for the genus; the 

 second maxillae have a long terminal segment swollen at its center 

 and armed there with a small spine on the inner margin. The terminal 

 portion beyond the swelling is divided longitudinally and the slender 

 halves are curved and bluntly rounded at their tips. The terminal 

 claw of the maxillipeds is stout, strongly curved, and acuminate. 

 The furca is shaped like the letter H, the sides straight and parallel, 

 the distal portion longer than the proximal. The basipod of the first 

 legs has a 2-segmented rudimentary endopod attached to its posterior 

 distal corner. The end segment of the exopod is tipped with four 

 curved claws of about the same size. The fourth leg is stout and 4- 

 segmented, the basal segment longer than the three terminal segments 

 combined, the latter about equal in length, each tipped with a claw. 

 Total length, 6 mm. Carapace, 3.95 mm. long, 3 mm. wide. 



Male. — Carapace elliptical, one-sixth longer than wide, the anterior 

 margin rather flat with a central sinus larger than in the female. 

 The median lobe is narrower and extends farther behind the lateral 

 lobes. The free segment is little more than a fourth the width of 

 the carapace, its lateral margins protruding strongly. The genital 

 segment is elliptical, a little longer than wide, without posterior 

 lobes or even corners. The abdomen is nearly as long as the genital 

 segment and half as wide and is made up of two segments. As in 



Eminens, protruding, with reference to the corners of the genital segments. 



