34 THE ENTOMOSTRACA OF 



Carapace ovato-oblong ; extremities obliquely rounded ; posterior end narrowest 

 and most oblique ; ventral margin curved from its centre towards the posterior 

 extremity ; dorsal margin straight : surface of the valves raised into three obscure 

 longitudinal ridges, holding the same relative position as the ridges on C. plicata ; 

 valves covered with a coarse reticulation of sub-quadrangular pits, arranged some- 

 what concentrically. 



Dorsal aspect acute-ovate ; end-view sub-ovate. 



This species differs from C. scrobiculata, Miinster, in the ridged character of the 

 valves, in being more oblong, in having the longitudinal parietes of the pits on the 

 central part of the valves more developed than the transverse, and in the absence of 

 the faint semicircular riblets which traverse the anterior portion of C. scrobiculata. 



The latter occurs in the Eocene deposits of France and Belgium, and in Tertiary 

 deposits of the North-west of Germany ; also at Dax in France, and near Parma in 

 Italy. 



Cythere scrobiculoplicata is not rare in the London Clay of Copenhagen Fields, 

 London ; and Mr. Wetherell has favoured me with a fine specimen from the London 

 Clay of Finchley, near London. 



Var. recta, nov. Plate VI, fig. 9. 



INCH. 



Length, T V Middle Eocene : East Woodhay, Hampshire. 



Carapace smaller than that of C. scrobiculoplicata, triangularly ovate, obliquely 

 rounded in front, and tapering symmetrically towards the rounded posterior extremity ; 

 the anterior portion of the valves not reticulated, but obscurely punctate, and bordered 

 by a narrow, raised, marginal rim ; the rest of the surface is ridged and reticulated on 

 the plan of C. scrobiculoplicata. 



A single valve occurred in some blue clay, from East Woodhay, Hampshire, proba- 

 bly belonging to the Bagshot and Bracklesham series. 



No. 18. Cythere Angulatopora, Reuss, sp. Plate IV, figs. 17, 18 a, 18 b ; and 



PI. VI, fig. 18. 



Cypridina Angulatopora, Reuss. Haidinger's Abhandl., iii, p. 86, t. 10, fig. 32. 

 Cythere Angulatopora, Bosquet. Mem. Couron. Acad. Belg., xxiv, p. 68, t. 3, fig. 5. 



(Cythereis) Angulatopora, Jones. Quart. Journ. Geol. Soc, p. 162, t. 3, 



fig. 12. 



INCH. 



Length, -?- to -fa Middle Eocene : England; France; Belgium. 



