169 



90. Pseudanthessius liber, (Brady). 

 (PI. XCIV). 



Uchomolgus liber, Brady, Monogr. of British Copepoda, Vol. Ill, p. 44, PI. LXXXVI, 



figs. 1 13. 



Specific Characters. Female. Body comparatively robust, with the 

 anterior division considerably tumefied and rounded oval in outline, greatest 

 width about in the middle. Cephalic segment very large, with a slight indi- 

 cation of a transverse suture behind the middle. Last trunk-segment, as usual, 

 very sharply marked off from the preceding one and rather narrow. Tail com- 

 paratively short, scarcely attaining half the length of the anterior division; 

 genital segment about as long as the 3 succeeding segments combined and 

 slightly dilated in its anterior part; anal segment about the length of the 

 preceding segment. Caudal rami rather short, scarcely longer than the anal 

 segment, and slightly divergent; seta of outer edge attached near the end; 

 apical setae less unequal than in the type species, those of the outer and 

 inner corner being well developed, though somewhat shorter than the 2 middle 

 ones. Anterior antennae not much elongated and only slightly attenuated, 

 being clothed with comparatively short and thick setae; the outer 2 joints 

 rather small, and combined about the length of the antepenultimate one. 

 Posterior antennae scarcely shorter than the anterior ones and comparatively 

 strongly built, the first 2 joints rather thick and massive, subequal in size, 

 and combined occupying about half the length of the antenna; last joint 

 cylindric in form, and provided at the end with several setae in addition to 

 the claws; the latter rather short, but somewhat unequal in size, one of them 

 being much stronger than the other 2. Maxillae with the terminal lappet 

 rather produced, and fringed along the posterior edge with delicate spinules; 

 palp with a very small seta inside, in addition to the 3 apical ones. Anterior 

 maxillipeds with the apical lash less abruptly bent at the base than in the 

 type species, and less coarsely denticulate at the edge. Posterior maxillipeds 

 comparatively smaller, with only a simple seta inside the propodal joint; 

 dactylar joint conically produced. 1st pair of natatory legs with the proximal 

 joint of the basal part remarkably expanded outside, 1st joint of outer ramus 

 much broader than the other 2, and having the spine of the outer edge rather 

 produced. Inner ramus of this and the 2 succeeding pairs somewhat longer 

 than the outer; that of 4th pair, however, scarcely as long as the first 2 joints 

 of the outer combined, and forming a single oblong fusiform joint without 

 any notch outside, apical spines rather unequal, the inner one being much 



