382 DR. G. S. BRADY ON THE OSTRACODA 
triangular. Lower antenne bearing, on the last joint but two, a brush of five sete, 
and at the base of the same joint a pedicellated vesicle. Second maxille 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 sete, one of which is pectinated. Postabdominal rami 
large, with two curved claws and a slender seta at the apex and three long sete on the 
inner margin. 
Pontocypris FABA (Reuss). (Plate LXIII. figs. 6a, 66 (2), 6c-Ge (¢). 
Bairdia faba, Reuss, “Ein Beitrag zur genaueren Kenntniss der Kreidegebilde Meklenburgs,”’ 
Zeitschrift d. deutsch. geol. Ges. 1855, p. 278, pl. 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 25, of male 3!5 inch (0°65, 0°75 millim.). 
Several examples were found in the bed “a Bryozoaires” of the ‘‘ Sables moyens,” 
and a few in the ‘* Panopwa menardi” bed (Sables inférieurs). The reference of the 
two forms figured in Pl. 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. 
Reuss’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. 1 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. 
PONTOCYPRIS PROPINQUA, nov. sp. (Plate LXIII. figs. 4 a—4 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 
