COPEPODS OP THE WOODS HOLE REGION 



187 



convex margins. First antennae 9 -segmented ; exopod of first legs 

 tipped with four small denticulate claws, increasing in length in- 

 wardly, and inside of these two or three slender naked setae. Inner 

 expansion of basal segment of fifth leg with 4 thick setae and a trans- 

 verse row of spinules on its anterior surface; distal segment rather 

 pointed, its inner marginal spine 

 large and stout. Total length, 1.1- 

 1.25 mm. 



Male. — Larger than the female; 

 hand of chela on first antennae rather 

 small and deeply lobed on its anterior 

 margin, the dactylus hatchet shaped, 

 with an accessory outer spine. Exo- 

 pod of third legs nearly as strongly 

 developed as in chelifei^ but the basal 

 segment is much shorter than the other 

 two combined and the distal segment 

 carries four spines instead of three. 

 The inner apical seta of the distal 

 segment of the fifth legs is as large as 

 the others and plumose. Total length, 

 1.25-1.35 mm. 



Remarhs. — This is one of our largest harpactids, and can be told 

 when alive by the transverse orange bands. Those on the abdomen 

 are more persistent in preservatives and may be readily seen after 

 the others have disappeared. Brian has given excellent figures of 

 many development stages of this copepod in Studi del Laboratorio 

 Marino Genova, 1921 (pp. 62-63). 



Figure 126. — Harpacticus uniremis: 

 a, Male, second endopod ; b, male, 

 fifth leg ; c, female, fifth leg 



ZAUSODES, new genus 



Body much depressed, short and broad, the metasome much wider 

 than the urosome, its segments expanded laterally into epimeral 

 plates ; fifth segment shorter than the fourth, but with well-developed 

 plates; genital segment distinctly divided and somewhat widened, 

 each half with epimeral plates ; abdomen 3-segmented, segments very 

 short and more or less telescoped ; caudal rami wider than long, with 

 short terminal setae. Kostrum broad and somewhat truncate at the 

 tip ; first antennae 8-segmented, the last four segments (terminal por- 

 tion) very short in female, much longer and strongly prehensile in 

 the male; second antennae well developed, the terminal segment 

 tipped with geniculate setae, the exopod slender and 1-segmented; 

 mandible with a large tripartite tooth at the outer corner, palp 

 biramose; maxillipeds strong and of normal structure. 



