408 DE. G. S. BEADY ON THE OSTEACODA 



posterior extremity of each valve are situated two large, polished head-like tubercles — 

 one near the dorsal, the other near the ventral surface. Seen from above, the outline 

 is somewhat boat-shaped, subtruncate behind, and with wide produced keel in front ; 

 greatest width situated in the middle, and equal to less than half the length. End 

 view ovate. Surface of the shell closely pitted with circular puncta. Length -^q inch 

 (0-65 millim.). 



C. nodosa occurred in moderate numbers in the Pecfuncnhis-hed, and also in the 

 Pa7wpaa-heds of Kiel and Edeghem. In general character it is very nearly allied to 

 C. leioptycha, Eeuss, but differs in minor details, being more tumid, less angular in its 

 contours, and wanting in longitudinal ribs. 



DESCRIPTION OF THE PLATES. 



The letters a, b, c, d in these illustrations refer to the various aspects of the shell, as follows :— 

 a, seen laterally ; b, seen from above ; c, seen from below ; d, seen from the front. 



PLATE LXII. 



Figs. 1 a-\ d. Ci/theridea papillosa, var. Figs. 4 a, 4 5. Cytheridea mulleri 2 . 



IcBvis. Figs- 4 c-4 e. Cytheridea milUeri <s . 



Figs. 2 a-2 c. Oytherella parallela. Figs. 5 «-5 d. Cytherella nodosa. 



Figs. 3 a-3 d. Cytheridea pinguis. Figs. 6 a, Qb. Cytherella elliptica. 



PLATE LXIII. 



Figs. 1 «-! (Z. Cythere tarentina. Figs. 5a-5rf. Paracypris polita. 



Figs. 2 a-2 (Z. Cytherideis{X) Uthodomoides. Figs. 6 a, 6 5. Pontocyjms faba 2 . 



Figs. 3a-3(Z. Cytherideis recta. Figs. 6 c-6 e. Pontocypris faba 6 . 



Figs. 4 a-4 c. Pontocypris 2»'opinqua. Figs. 7 a-l c. Bairdia oviformis. 



PLATE LXIV. 



Figs. 1 rt-1 d. Cythere cedicMlus. Figs. 6 a, 6 J. Cythere plicatula. 



Fig. 2. Paradoxostoma ensiforme. Figs. 7 a-1 d. Cythere wetherellii. 



Figs. 3 a-3 d. Cythere cicatricosa. Figs. 8 a-8 d. Cythere latimarginata. 



Figs. 4a, 4 5. Cythere cribrosa'\ Figs. 9 a, Qb. Cythere limicola. 

 Figs. 5 a-5 d. Cythere petrosa. 



PLATE LXV. 

 Figs. 1 a-1 d. Cytliere elUpsoidea. Figs. 4 a, 4 J. Cythere woodiana. 



Figs. 2 a-2 A. Cythere jurinei. Figs. 5a-5(Z. Cythere plicata. 



Figs. 3 a, 3 J. Cythere belgica. 



