378 



MR. G. S. BRADY'S MONOGRAPH OF 



curved claw ; the last pair armed also with a short seta, which is directed upwards. 

 Postabdominal rami large, armed at the extremity with two strong curved claws, and a 

 short slender seta ; the posterior margin also bearing two long setae. One eye. 



This genus approaches very closely to the freshwater Cyprides, especially in the 

 structure of the second pair of jaws, which have a distinct branchial appendage and a 

 conical palp, ending in three setae, as in Cypris, Candona, &c. Prom the genus Candona 

 it is clearly separated by the presence of the branchial plate of the second maxillse ; and 

 Sars observes that the second pair of feet, which in Cypris and Candona are slender, much 

 bowed, and constantly tucked up within the valves, are here stronger and, during the 

 movement of the animal, may often be seen partially to extrude themselves. The shell 

 partakes much more of the characters of the Cytheridae than of the Cypridse, being very 

 hard and compact in structure. The short antennal setae are evidently adapted for a 

 crawling motion in or on the mud, rather than for swimming. The only British member 

 of the genus is 



Paracypris polita, G. 0. Sars. (Plate XXVII. figs. 1-4, and Plate XXXVIII. fig. 2.) 



Paracypris polita, Sars, Oversigt af Norges marine Ostracoder, p. 12. 



Scandinavian type. Distribution : Recent — Norway, Great Britain. Fossil — Scotland, Norway, glacial. 



Seen from the side, the carapace is elongated, siliquose, or subtriangular ; greatest 

 height at the anterior third, and equal to more than one- third of the length. Anterior 

 extremity evenly rounded, posterior much attenuated, pointed. Dorsal margin arched 

 in front, and sloping steeply behind ; ventral concave along the greater portion of its 

 length. Seen from above, it is much compressed, oval, not quite four times as long as 

 broad, greatest breadth in front of the middle ; extremities obtusely pointed. End view 

 oval. Shell smooth and polished, almost destitute of hairs : colour yellowish white. 

 The setae of the upper antennae are nearly equal in length to the six preceding joints, 

 sixth joint longer than the rest. The antepenultimate joint has at its inner apical angle 

 two setae ; and from its basal portion springs a fine tubular filament, which ends in a 

 pyriform sac or vesicle. The postabdominal rami are gently curved, the exterior claw 

 somewhat longer than the other. Male unknown. 



Length i^-j height -^5 in. ; , 13 ^{ . i^^- 

 Hab. In moderate depths of water, 3-30 fathoms. Channel Islands, and Loch Alsh, Hebrides {Mr. 



Jeffreys) ; Shetland {Mr. Waller and Mr. Robertson) ; Tobermory, at roots of Laminarice {Rev. A. M. 



Norman) . 



In no British specimens have I seen the purple or reddish markings which are 

 mentioned by Sars as characterizing the shell of this species, and which are quite distinct 

 in specimens which I have received from him. But it is more than probable that the 

 colours may have been destroyed, as well as the animal itself, by the prolonged drying 

 amongst sand or mud to which my specimens have been subjected. The curious 

 " hyaline vesicle " attached to the second antenna, which occurs in this genus and also 

 in Fontocypris, is an organ the use of which it is difficult to conjecture. The vesicle 

 itself appears sometimes as if filled with a granular matter ; and the pedicle is, I think, 

 tubular ; but I have been unable to trace it further than its attachment to the antennal 



