710 Brady and Norman — Monograph of the Marine and Freshwater Ostracoda 



ends in a stout seta. Larger branch of antenna eight-jointed. Mandible bent 

 sharply downwards, very small and slender, very feebly toothed, all except the 

 external tooth nearly obselete ; palp large, the first joint bearing a small trisetose 

 branchial lamina. Caudal laminjB bearing eight marginal ungues, tiie first two 

 much smaller than the rest, which gradually increase in length backwards ; 

 between the ungues the margin is only slightly px'oduced in an angular fashion ; 

 no setose tufts on the abdomen proper. In other respects the animal resembles 

 Polycope. 



1. Polycopsis compressa (Brady & Robertson). 



(PI. Liv., figs. 11, 12 ; PI. Lxvii., figs. 4-8.) 



1869. Polycope compressa, . . Brady & Robertson, " Ann. and Mag. Nat. 



Hist," ser. iv., vol. iii., p. 20, pi. xxi., 

 figs. 5-11. 

 1894. ,, ,, . . MiJLLER, G. W., " Die Ostracoden des Golfes von 



Neapel." p. 238, pi. vii., figs. 34-36, 38 ; 

 pi. viii., fig. 21. 



Shell (PL LIV., figs. 11, 12), seen from the side, almost circular; dorsal and 

 ventral margins very nearly equall}^ arched ; anterior margin dentated in a saw- 

 like manner with about eighteen teeth, which gradually fade out at each end of 

 the series (PI. lxvii., fig. 7). Seen from above, the outline is compressed, ovate, 

 greatest width situated in the middle and equal to somewhat less than half the 

 length ; anterior extremity moderately tapered, obtusely pointed ; posterior broader 

 and emarginate in the middle. Surface of the shell smooth, or finely punctate, 

 and divided by a reticulated pattern into polygonal areas (PI. lxvil, fig. 8). 



Antennules (PI. lxvii., fig. 4), especially the first two joints, very stout; the 

 first joint bears only one marginal seta, second joint quite twice as long as the first, 

 its outer margin produced into two long whip-like processes, which are very wide at 

 the base (occupying nearly the whole length of the joint) and taper quickly to the 

 points, each ending in a long lash; third joint very short and without setae; fourth 

 more than twice as long as the third, and. having a seta on each margin near the 

 apex; last joint very minute, and carrying five extremely long and slender 

 terminal sette. 



Mandible (fig. 5) very small and bent on itself almost at a right angle (as in 

 Polycope), its extremity divided into one sharp, well defined tooth, and a few 

 much smaller and weaker processes ; palp like that of Polycope, except that the 

 laminar process of the first joint is trisetose. Ungues of the caudal laminae 



