COPEPODS OF THE WOODS HOLE EEGIOlSr 



407 



Figure 254. — Caligus pelamy- 

 dis: a. Female, dorsal ; bj 

 female, fourth leg 



Distribution. — Denmark (Kr0yer) ; Mediterranean (Richiardi) ; 

 coast of Italy (Brian) ; South African coast (Brady) ; Woods Hole 

 (Wilson). 



Color. — Body a uniform yellowish white, lighter on the genital 

 segment, which is almost pure white ; eye reddish. 



Female. — Carapace less than half the 

 entire length; lunules minute and not pro- 

 jecting; fourth segment one-fourth the 

 width of the carapace; genital segment 

 acorn-shaped, squarely truncated poster- 

 iorly, without leg rudiments. Abdomen 

 one-fourth longer than genital segment, 2- 

 segmented, the basal segment five times as 

 long as the terminal segment; caudal rami 

 small and inclined toward each other. 

 Fourth legs 4-segmented, with five spines 

 and no seta; furca short, with very wide 

 and curved branches. Total length, 3-4 

 mm. 



Male. — Unknown. 



Remarks. — This is the only species here presented in which the 

 fourth legs are 4-segmented. Kr0yer has figured two pairs of leg 

 rudiments on the genital segment, but none were found on these 

 American specimens. 



CALIGUS BONITO Wilson 

 Figure 255 

 Caligus bonito Wilson, Proc. U. S. Nat. Mus., vol. 28, p. 589, pi. 13, 1905. 



Occurrence. — Both sexes found in the mouth and gill cavity of the 

 oceanic bonito {Gyninosarda pela/mis) in company with the pre- 

 ceding species at Woods Hole. 



Distrihution. — ^West coast of Africa (Brian). 



Color. — Body a pale transparent yellow, the tips of the lateral 

 lobes of the carapace and the adjacent thoracic area on the dorsal 

 surface thickly spotted with light rusty brown. The copepod thus 

 appears to have two large brown eyes at the posterior comers of the 

 carapace; true eyes light red. 



Female. — Carapace less than half the entire length ; lunules large, 

 circular, not projecting; fourth segment one-third the width of the 

 carapace; genital segment two-thirds as wide and nearly as long as 

 the carapace, contracted into a very short waist anteriorly, with 

 broadly rouncled posterior lobes without leg rudiments. Abdomen 

 as long as genital segment but only half as wide, apparently 1-seg- 

 mented, but really two segments fused as shown by its development ; 



