COPEPODS OP THE WOODS HOLE EEGION" 



441 



Figure 277. — Parapandarus nodosus: a. 

 Female, dorsal ; b, male, dorsal 



and a wide posterior sinus, with leg rudiments projecting behind the 

 posterior corners. Abdomen 1-segmented, covered ventrally with a 

 large circular plate and dorsally with a much smaller sixth segment 

 plate; caudal rami modified like those of Pandai^us. Total length, 

 12-14 mm. 



Male. — Lateral margins of carapace quite convex, posterior margin 

 straight ; posterior lobes one-third the length of the carapace ; lateral 

 plates of second segment extend- 

 ing diagonally to the tips of the 

 posterior lobes of the carapace; 

 third segment transversely ellip- 

 tical and evenly rounded; fourth 

 segment narrowed into a short 

 waist in front of the lateral knobs. 

 Posterior lobes of the genital seg- 

 ment curved inward, without any 

 leg rudiments; basal segment of 

 abdomen narrower than termi- 

 nal; caudal rami enormous, their 

 inner margins overlapping, each 

 with four rather small apical 

 setae. Total length, 13-15 mm. 



Remarrhs. — The female of this genus may be recognized by the 

 imbricated dorsal plates on the second, third, and fourth segments, 

 the male by the lateral knobs on the fourth and genital segments. 

 Unlike Pcmdarus it is found on the gills and not the fins of its shark 

 host. 



Family CECROPIDAE 



Genus CECROPS Leach, 1816 



Female. — Head fused with first segment, carapace with broad pos- 

 terior lobes ; second and third segments fused, the former with large 

 lateral plates, the latter with small fused median plates ; fourth seg- 

 ment with larger fused plates covering the anterior portion of the 

 genital segment, with a narrow median sinus. Genital segment 

 small, with fused dorsal plates extending beyond the tips of the 

 caudal rami. Abdomen 1-segmented, as large as genital segment, its 

 ventral surface produced laterally and anteriorly into lobes. Egg 

 strings irregularly coiled and hidden between the dorsal plates of 

 the genital segment and the ventral lobes of the abdomen. Rami 

 of first three pairs of legs 2-segmented, of fourth pair 1-segmented ; 

 no leg rudiments on the genital segment. 



Male. — A miniature female except as follows: Dorsal plates of 

 fourth segment covering both genital segment and abdomen, the for- 



