406 DE. G. S. BEAD'S ON THE OSTEACODA 



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. 



Cythekideis recta, nov. sp. (Plate LXIII. figs. 3«-3 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 2^ inch 

 (0-90 miUim.). 



Occurs very rarely in the zone a Bryozoaires. 



Genus Paradoxstoma, 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 antennoe 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 

 branchinl appendage. Terminal lobes of first maxilla very narrow. Branchial plate 

 elongated, and having two deflexed setae at the base. Feet short and robust, claws very 

 short and curved. One eye. 



Paradoxostoma ensiiorme, Brady. (Plate LXIV. fig. 2.) 



Paradoxostoma ensiforme, Brady, Monogr. Eecent Brit. Ostrac. p. 460, pi. xxxv. figs. 8-11 ; Brady, 

 Crosskey, and Eobertson, Monog. Post-tert. Entom. Scotland, &c., p. 215, pi. x. figs. 37,28. 



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 -^ inch 

 (0-75 millim.). 



