382 DE. G. S. BRADY ON THE OSTEACODA 



triangular. Lower antennae bearing, on the last joint but two, a brush of five setae, 

 and at the base of the same joint a pedicellated vesicle. Second maxillae having no 

 branchial appendage. Palp large and subpediform, 3-jointed; last joint in the female 

 with two long, curved claws. Second pair of feet flexuous, 4-jointed ; last joint short 

 and ending in several short setae, one of which is pectinated. Postabdominal rami 

 large, with two curved claws and a slender seta at the apex and three long setae on the 

 inner margin. 



PoNTOCYPRis FABA (Reuss). (Plate LXIII. figs. 6 a, 6 5 ( ? ), G c-G e ( d ). 



Bairdia faba, Reuss, " Ein Beitrag zur genaueren Kenntniss der Kreidegebilde Meklenburgs," 

 Zeitschrift d. deutscb. geol. Ges. 1855, p. 278, pi. x. fig. 2. 



Carapace of the female, as seen from the side, subtriangular ; greatest height situated 

 in front and equal to one half of the length ; anterior extremity broadly rounded, 

 posterior rounded but much attenuated ; dorsal margin very strongly arched and highest 

 in front of the middle ; ventral almost straight, slightly sinuated. Seen from above, 

 oblong-ovate, tapering suddenly in front and very gradually toward the posterior extre- 

 mity ; greatest width situated at the anterior third, and equal to more than one third 

 of the length. The right valve overlaps the left in the middle of the ventral surface. 

 Surface smooth or slightly granulated. The male differs from the female in the greater 

 size of the shell, in its more attenuated proportions, and in being subacuminate at the 

 hinder extremity. Length of female ^, of male ^ inch (0'65, 0'75 millim.). 



Several examples were found in the bed " a Bryozoaires " of the " Sables moyens," 

 and a few in the " Paiiopcea menardi " bed (Sables inferieurs). The reference of the 

 two forms figured in PI. LXIII. to the male and female sexes, respectively, is of course 

 hypothetical ; but the general characters of the two forms are so similar, and the points 

 of difference are so exactly those which we observe as sexual distinctions among the 

 recent Ostracoda, that I entertain very little doubt as to the correctness of the diagnosis. 

 Eeuss's figure of a single valve of his " Bairdia faba " agrees exactly with the present 

 species; I therefore do not hesitate to adopt that name. The recent Pontocypris 

 mytiloides approaches it also very closely in general character. I think it very probable 

 that Egger's Bairdia dactylus and its variety punctata may also be identical with this 

 species; but the figures given by that author are unfortunately so extremely coarse 

 that it is impossible in many cases to make an accurate diagnosis. 



PoNTOCYPKis PKOPiNQUA, nov. sp. (Plate LXIII. figs. 4 a-i c.) 



Carapace, seen laterally, subtriangular, highest in the middle ; height equal to half 

 the length ; anterior extremity evenly, posterior obliquely rounded ; superior margin 

 boldly and evenly arched, inferior nearly straight. Seen from above, the outline is 

 ovate, pointed in front and obtusely rounded behind ; greatest width situated in the 



