30 THE ENTOMOSTRACA OF 



punctation very fine, and tying in depressed lines or striae in young individuals ; 

 coarser and less distinctly linear, and somewhat transverse, in old specimens. A 

 variety, white and smooth, almost destitute of punctations, or rather with exceedingly 

 minute linear pittings, is common ; and some individuals are partially punctated. The 

 hinge is strongly developed. 



Dorsal aspect elongate-acute-ovate ; end-vieiu suborbicular. 



This species appears to belong to the same type as C. Jurinei, Miinster, and its 

 varieties, figured and described by Bosquet (' Descript. Entom. Tert.,' p. 56, t. 2, 

 figs. 9, 10), C. Meyni, Reuss ('Zeitsch. Deut. geol. Ges.,' viii, p. 279, t. 10, fig. 5), 

 and Bairdia (?) semipicnctata, Bornemann (Jhid., vii, p. 359, t. 21, fig. 1). I have met 

 with a very similar form in Tertiary sand from Bordeaux. 



Cythere Woodiana occurs very plentifully, in different stages of growth, and with 

 several variations as to intensity of punctation, in the Crag of Suffolk, — and bears the 

 name of Mr. Searles N. Wood, who has for many years, and with great success, col- 

 lected, studied, and elucidated the fossils of the- Crag. To Mr. Wood I am indebted 

 for the majority of the specimens from the Crag described in this Monograph. 



No. II. Cythere laqueata, spec. nov. Plate III, figs. 3 a — 3 h. 



INCH. 



Length, -^-g Pleistocene : Red Crag, Essex. 



Pliocene : Crag, Suffolk. 



Carapace broad-ovate-oblong, rounded somewhat obliquely in front, contracted and 

 rounded behind ; extremities denticulate, depressed ; dorsal margin slightly arched : 

 ventral margin somewhat sinuous : valves nearly equal ; surface coarsely punctate with 

 large subquadrate pits : Mnyes very strong. 



Dorsal profile broadly acute-ovate ; end-vieio subovate. 



In a translucent young valve the surface is smooth, but a distinct coarse reticula- 

 tion is seen by the opacity of the parietes of its meshes in the tissue of the valve : 

 these meshes appear to be subsequently represented by the superficial pittings. 



Cythere laqueata is rather rare in the Crag of Sutton, &c., in Suffolk, where it 

 occurs with C. Woodiana, C. Macropora, &c. It occurs also in the Upper or Red Crag 

 at Walton-on-Naze, Essex. 



No. 12. Cythere Dictyosigma, spec. nov. 



INCH. 



Length, J- Pliocene : Suffolk. 



