COPEPODS OF THE WOODS HOLE REGION 



401 



ySf TB>-, 



FiGDRE 247. — Caligus rufus: a. 

 Female, dorsal ; 6, female, 

 fourth leg 



CALIGUS RUFUS Wilson 



FiGXJKE 247 



Caligus rufus Wilson, Proc. U. S. Nat. Mus., vol. 33, p. 597, pi. 50, 1908. 



Occurrence. — Found on the outer surface and in the gill cavity of 

 the sea catfish {Felichthys marinus) at Woods Hole. 



Distribution. — Not found outside the 

 Woods Hole area. 



Color. — Body a bright orange-yellow, 

 thickly and irregularly penciled above and 

 below with lines and spots of brilliant 

 reddish brown; eye ruby-red. 



Female. — Body elongate and narrow; 

 carapace elliptical, more than half the en- 

 tire length; lunules large, but not project- 

 ing ; fourth segment short ; genital segment 

 longer than wide, with leg rudiments on 

 the ventral surface. Abdomen 1-seg- 

 mented, tapered strongly backward, the 

 distal end half as wide as the base ; caudal 

 rami twice as long as wide, inclined toward 

 each other and meeting at their tips. Rami of third legs widely sepa- 

 rated, a claw at base of exopod; fourth leg 3-segmented, with five 

 spines and a seta, the inner terminal spine the longest. Total length, 

 4.4 mm. 



Male . — Unknown . 



Remarks. — This species has thus far been found in no other loca- 

 tion and upon no other host. The strongly tapered abdomen is the 

 best single character. 



CALIGUS SCHISTONYX Wilson 



FiGXJBE 248 

 Caligus scMstonyx Wilson, Proc. U. S. Nat. Mus., vol. 28, p. 564, pi. 6, 1905. 



Occurrence. — Both sexes found on the outside surface of menhaden 

 and bluefish at Woods Hole. 



Distribution. — Beaufort, N. C. ; Chesapeake Bay (Wilson). 



Color. — Body dark yellow, inclining to brown, without any pig- 

 ment markings; eye dark blue. 



Female. — Carapace more than half the entire length ; frontal margin 

 squarely truncated ; lunules large and circular ; fourth segment short 

 and half as wide as the genital segment ; the latter with convex sides 

 and projecting lobes at the posterior corners, but without leg rudiments. 

 Abdomen 1-segmented, shorter than the genital segment and less than 

 half as wide; caudal rami widely separated. Terminal claws of first 



