400 DR. G. S. BRADY ON THE OSTRACODA 
Found rather sparingly in both beds of the Sables inférieurs, and also in the zone a 
Tsocardium cor (Sables moyens). 
LOXOCONCHA VARIOLATA, nov. sp. (Plate LX VIII. figs. 4 a—4 d.) 
? Cythere subtriangularis, Speyer, Ostracoden der Casseler Tertiirbild. p. 26, pl. il. fig. 6. 
Carapace, as seen from the side, oblong, subrhomboidal; anterior and posterior 
extremities almost exactly alike, rounded below and bevelled off above the middle ; 
dorsal margin straight, ventral convex and slightly sinuated in front; height equal to 
more than half the length. Seen from above, ovate, tapering rather suddenly to the 
extremities, which are sharply mucronate; width about equal to the height. End view 
subquadrate, somewhat narrowed and rounded off at the apex. Shell-surface marked 
by rather large polygonal excavations, which tend to run in longitudinal rows, especially 
towards the anterior margin and on the ventral surface. Behind the middle of the 
ventral margin the valves are produced into a distinct but not very prominent angulated 
aleeform ridge. ‘This, however, is absent or obsolete in some specimens, which seem 
to belong to this species, as they agree with it in other respects. Length 35 inch 
(0°66 millim.). 
This species may very possibly be identical with Cythere subtriangularis, Speyer, the 
figures of which agree almost entirely with it, except in the absence of any angulated 
ridge; for the present, however, I prefer to consider it as distinct. Cythere hastata, as 
figured by Egger and (more doubtfully) by Reuss, are also either the same or nearly 
allied forms ; without examination of authentic specimens it is impossible to pronounce 
with certainty. Lastly, the species described by myself (Loxoconcha angustata and 
LL. alata) are both nearly allied but distinct, as also is L. multifora (Norman). 
L. variolata has been found pretty plentifully in the Pectunculus-bed and in the zone 
a Bryozoaires, and less abundantly in the Panopwa-menardi bed (Edeghem and Kiel). 
Genus XESTOLEBERIS, G. O. Sars. 
Shell smooth and polished, ornamented with small, round, distant papilla, much 
lower in front than behind, in the female very tumid behind; hinge-joint formed by 
a dentated projecting crest of the left, which is received into an excavation of the right 
valve ; ventral margin of both valves incurved in front of the middle. Upper antenne 
6§-jointed, the last four joints successively decreasing in length and bearing very short 
simple sete ; lower antenne short, 4-jointed. Flagellum of moderate length. Mandible- 
palp 4-jointed. Branchial appendage small and bearing only two sete. Maxille as in 
Loxoconcha. Feet short. Postabdominal lobes bearing two sete. Eyes distinct. Ova 
and immature young borne within the shell of the female. 
XESTOLEBERIS DEPRESSA, Sars. (Plate LXVI. figs. 8 a—8 d.) 
Xestoleberis depressa, G. O. Sars, Oversigt af Norges marine Ostracoder, p. 68 (1865); Brady, 
