259 



21. CYTHERIDEA WINWOODIANA, Sp. n. 

 PI. i., figs. 2 a, b, c, d. 



Smooth, sub-oblong in outline ; anterior hinge sub-angulate, as 

 commonly seen in these forms of Ostracoda. Edge view, narrow- 

 lanceolate, blunted anteriorly ; end view, sub-ovate, the valves 

 not being very convex. Hinge consists of a crenulated tooth at 

 ■each end of a shallow groove in one valve, and corresponding 

 pitted depressions at the extremities of a delicate ridge in the 

 other. This hingement is common to the greater number of 

 Ostracoda here to be described, and has therefore been figured 

 only in a few cases (pi. iii., fig. 11 ; pi. iv., fig. 9). 



Cylheridca Winwoodiana is comparable with Cytheridea sub- 

 perforala, Jones (Quart. Journ. Geol. Soc, vol. xl., 1884, pi. xxxiv., 

 fig. 26) ; but the anterior extremity is less contracted and less 

 oblique, while the posterior is more fully rounded. 



Named after the Eev, H. H. Winwood, M.A., F.G.S., by whose 

 kindness we received some of the material from which these 

 Ostracoda are here described. 



Two examples from the Yellow Fullers-earth Clay, Midford. 



22. CYTHERIDEA COARCTATA, Sp. 11. 



Pi. i., figs. 3 a, b, c. 



A narrow, convex, approximately oblong form, with oblique 

 ends, making it somewhat subrhomboidal. Surface smooth, 

 marked with a few scattered small pits. Edge view, long-ovate, 

 ■compressed at the middle ; end view, acute-ovate. A form 

 perhaps allied to this is the Cytheropsis obliquepundata, Terquem 

 (Mdm. Soc. Geol., France, ser. 3, tonie iv., 1885, p. 23, pi. iii., fig. 13^. 



One specimen ; Blue Fullers-earth Clay, Midford. 



23. CYTHERIDEA PUTEOLATA, Sp. 11. 



PI. i., figs. 7 a, b, c. 

 Also a sub-oblong Cytheridea, having the ventral and dorsal 



