406 DR. G. 8. BRADY ON THE OSTRACODA 
This is one of the commoner species in the Antwerp beds, occurring in most of the 
deposits which we have examined, and usually in considerable quantity. M. Bosquet 
obtained it from several of the Eocene and Miocene deposits of France, and states also 
that he had seen a living specimen from the coast of Holland. In all probability, 
however, this must have been an example of Cytheridea elongata, Brady, which bears a 
close resemblance to the present species, but is, so far as I can judge, distinct. I have, 
however, considerable doubt as to the genus to which C. lithodomoides should be referred. 
CYTHERIDEIS RECTA, noy. sp. (Plate LXIII. figs. 3 a8 d.) 
Carapace compressed, oblong, somewhat like a grain of rice in shape ; seen from the 
side, linear-ovate, depressed in front, of nearly equal height throughout, height equal 
to rather more than one third of the length, obtusely pointed in front, rounded behind, 
dorsal and ventral margins both straight or very slightly convex. Seen from above, 
narrow ovate, extremities nearly equally pointed, width not more than one third of 
the length. End view nearly circular. Shell-surface perfectly smooth. Length 3g inch 
(0:90 millim.). 
Occurs very rarely in the zone 4 Bryozoaires. 
Genus Parapoxstoma, Fischer. 
Shell thin and fragile, smooth, shining; valves subequal, mostly much higher behind 
than in front, usually elongato-ovate; hinge-joint simple; ventral margins notched 
in front, so that when the valves are closed there is still an elongated orifice through 
which the suctorial mouth can be protruded. Upper antennz very slender, 6-jointed ; 
lower more robust, 5-jointed. Flagellum large and almost as thick as the antenna itself. 
Mouth suctorial; labrum and labium forming together a large process, projecting 
downwards and ending in a disk in the middle of which is the orifice of the mouth ; 
mandibles very slender, styliform; palp slender, indistinctly jointed and without 
branchial appendage. ‘Terminal lobes of first maxilla very narrow. Branchial plate 
elongated, and having two deflexed sete at the base. Feet short and robust, claws very 
short and curved. One eye. 
PARADOXOSTOMA ENSIFORME, Brady. (Plate LXIV. fig. 2.) 
Paradoxostoma ensiforme, Brady, Monogr. Recent Brit. Ostrac. p. 460, pl. xxxv. figs. 8-11; Brady, 
Crosskey, and Robertson, Monog. Post-tert. Entom. Scotland, &c., p. 215, pl. x. figs. 27, 28. 
Valves, as seen from the side, somewhat scimitar-shaped, much higher behind than in 
front, greatest height scarcely equal to half the length and situated behind the middle ; 
anterior extremity obtusely pointed; posterior obliquely rounded, slightly produced above 
the middle; superior margin boldly arched, inferior gently sinuated in the middle. Seen 
from above, compressed, ovate, with pointed extremities. Shell smooth. Length 3'; inch 
(0°75 millim. ). 
