32 THE VOYAGE OF H.M.S. CHALLENGEE,. 



FcDxicypris polita, G. 0. Sars. 



Paracypris ipolita, G. 0. Sars, Oversigt af Norges marine Ostracoder, p. 12; Brady, Monograph 

 of Eecent British. Ostracoda, Trans. Liu. Soc, vol. xxvi. p. 378, pi. xxvii. figs. 1-4, and 

 pi. xxxviii. fig. 2. 



A few specimens of Paracypris polita were found amongst mud, brought up by tbe 

 anclior in Vigo Bay ; others, very doubtfully referable to the same- species, occurred 

 in the proceeds of the tow-net at traM^, from Wellington Harbour, New Zealand, and 

 in a sounding from a depth of 420 fathoms, October 20, 1875. 



All these examjDles, however, are so imperfect and ill-developed that to describe or 

 figure them woidd be quite useless. The species is known hitherto only as inhabiting 

 the seas of Northern Europe. 



Phlyctenophora,^ n. gen. 



Carapace (PI. III. fig. 1, a) elongated, not higher in front than behind; shell smooth, 

 and usually more or less ornamented ■ndth dark-coloured blotches or strise. Anterior 

 antennae (fig. 1, e) seven-jointed, beset with moderately long and slender setae ; posterior 

 (fig. 1,/) four-jointed, stout, ending in four strong curved claws; second joint bearing 

 a stalked hyaline vesicle, and a brush of short setae. Mandible, strongly toothed at the 

 apex (fig. 1, g) bearing a four-jointed palp, which is destitute of a branchial appendage (?). 

 First pair of maxillae divided into four linear setiferous segments (fig. 1, h), and having at 

 the base a branchial plate bearing six setae ; second pair (fig. 1, i) also bearing a Ijranchial 

 appendage, and a small conical palp. First pair of feet five-jointed, terminating in a long 

 slender curved claw (fig. 1,^); second pair (fig. 1, Z.-) four-jointed (?), flexuous, provided 

 with a movable hinge between the second and third joints ; terminal claw long, reflexed 

 against the limb. Postabdominal rami (fig. 1, I) well developed, bearing two strong- 

 terminal claws. Spermatic gland of the male (fig. l,m) cylindrical, beset with a spiral of 

 delicate setose filaments. 



This seems to be sufiiciently distinguished from the preceding genus by the absence 

 of a branchial appendage to the mandible palp, and by the flexuous second foot, while from 

 Macrocypris it difi"ers, not only in the characters of the mandibles and maxillae, but in 

 having well-developed postabdominal rami ; also in the structure of the spermatic glands. 



The genera Paracypris and Phlyctenophora, both in external appearance, and in the 

 structure of the various parts of the animal, are more nearly allied to the fresh water 

 Cypridae than are any other marine genera. Many forms probably yet remain to be 

 discovered, which will more completely bridge over the gap between these and the 

 Cytheridae, and the classification of some of the species described in this monograph, and 

 known only by their shells, must be looked upon as merely provisional. In this category 



' 'iXiixran/a, a blotch ; ipipa, I carry. 



