COPEPODS OF THE WOODS HOLE REGION 



387 



second antennae 3-segmented, prehensile; rami of first four pairs of 

 legs 3-segmented; fifth legs uniramose, 2-segmented. A single spe- 

 j cies in the present area. 



r NOTODELPHYS AGIUS Thorell 



FlGTJBE 238 



Notodelphys agilis Thoeell, Kongl. Vet. Akad. Handl., vol. 3, no. 8, p. 40, pis. 4, 

 5, 1859.— Saes, Crustacea of Norway, vol. 8, p. 35, pi. 17, fig. 3, 1921. 



Occurrence. — Three females from 

 Ascidia 'parallelogramma at Woods Hole, 

 1925. 



Distribution. — C oast of Bohusliin 

 (Thorell) ; British Isles (Brady) ; coast 

 of France (Canu) ; Bay of Fundy (U. S. 

 National Museum). 



Color. — Body transparent with a whitish 

 tinge, the ripe ova dark reddish brown ; eye 

 ruby-red. 



Female. — Incubatory pouch oval in dor- 

 sal outline, widened posteriorly; caudal 

 rami almost five times as long as wide, the 

 outer seta attached to a small protuberance 

 at the center of the outer margin. Prox- 

 imal segment of fifth legs broad and smooth, 

 without cilia, its outer margin bearing a 

 digitiform process tipped with a filiform 

 seta. Distal segment not constricted at its base, irregularly pent- 

 agonal, with a slender apical seta and a shorter one at the inner distal 

 corner. Total length, 3.4^3.6 mm. 



Male. — Unknown. 



Remarks. — This species is most easily distinguished by the form 

 and armature of the caudal rami, the outer seta being almost at the 

 center of the outer margin. The inner margin of these rami is often 

 destitute of the usual cilia, which is exceptional for the genus. 



Family DOROPYGIDAE 



Genus DOROPYGUS Thorell, 1859 



Body in the female distinctly compressed laterally and curved 

 ventrally, in the male cylindrical and tapered posteriorly; head and 

 first three thoracic segments distinctly separated; fourth and fifth 

 segments fused into a huge incubatory pouch, produced gibbously 

 backward, overlapping the genital segment. The caudal rami are 

 elongate, narrowed, and sometimes coiled distally. First antennae 

 8- or 9-segmented, the two basal segments very broad ; second anten- 



FiGURE 2 3 8. — Notodelphys 

 agilis: a. Female, dorsal 

 (after Sars) ; b, female, 

 fifth leg 



