708 Brady and Norman — Monograph of the Marme and Freshivater Ostracoda 



Distribution. — In many places on the Norwegian Coast (Gr. O. Sars). 



The surface-sculpture of this species is variable, and tends to become obsolete 

 altogether in old and thick sjiecimens ; the reticulated pattern being visible only 

 in what seem to be comparatively young specimens. Professor G. 0. Sars notes 

 that the motions of the animal are very lively and much resemble those of some 

 of the Lynceidse such as Chydorus; and this we are able to vei'ify from our own 

 observation. He also says that it is found chiefly in places where the bottom is 

 covered with a thin layer of mud, and this accords fairly well with our own 

 experience. 



2. Polycope punctata, G. 0. Sars. 

 (PI. Lxvii., figs. 9-12.) 



1869. Poll/cope punctata, . . Sars, G. 0., "Nye Dybvandscrustaceer fra Lo- 

 foten" (Vidensk. Selsk. Forhand.), p. 27 

 (separate copy). 



" Shell, seen from the side, almost circular, scarcely at all produced in front, 

 the margins more evenly rounded than in P. orbicularis. Seen from above, rather 

 tumid, the greatest width much exceeding half the length ; valves thickly beset 

 with minute depressed puncta, but only very slightly reticulated; colour very 

 pale green." — (G. 0. Sars.) 



Basal joint of the antennule (fig. 10) about as long as the second joint; 

 terminal joint more slender, and about two-tliirds as long as the preceding ; the 

 whole limb devoid of hairs, except at the extremity, which bears five long, slender 

 setae. Mandible (fig. 11) divided at the apex into five sharp teeth, one of which 

 is setiform ; palp consisting of two very stout sub-quadrate joints, each of which 

 is furnished with three setce on its inner margin, the last also with four rather 

 long ajiical setae (" anterioribus 2 valde elongatis et curvatis," Sars); branchial 

 lamina bearing only one short seta. Caudal laminae (fig. 12) fumiished with six 

 ungues and with very small intercurrent marginal teeth ; the ungues decrease 

 only very slightly in length from behind forwards. Length "70 mm. 



Habitat. — Coasts of Norway, in depths of 120—250 fathoms, not common 

 (G. 0. Sars). Some specimens dredged in Loch Fyne are doubtfully referable to 

 this species. 



This species is known to us only from a single authentic specimen kindly sent 

 to us by Professor G. 0. Sars. Of this specimen we give a figure (fig. 9). In 

 shell structure it seems to differ scarcely at all from P. orbicularis, but the details 

 of the antennules, mandibles, and caudal laminae are sufficiently distinct to 



