36 . THE ENTOMOSTRACA OF 



No. 20. Cythere Trachypora, spec. nov. Plate III, figs. 9/ — 9 i. 



INCH. 



Length, Jj Recent : Norway. 



Pliocene : Suffolk. 



Cara2)ace sub- quadrangular ; somewhat tapering posteriorly ; rounded obliquely in 

 front; contracted behind: valves showing the three tubercles, the two posterior of 

 which are prolonged forwards as faint ridges : surface roughly reticulato-punctate. 



Dorsal aspect compressed-subovate, with produced ends. 



Cytliere Tracliyopora differs from C. Macropora (with which at first I associated it 

 as a dwarfed variety) in being smaller, with a more depressed and uneven surface, on 

 which the posterior tubercles are more apparent ; also in being less angular, and in 

 having its ornamentation less distinctly sculptured. It appears to stand between 

 C. Macropora and C. Hehertiana, Bosquet. 



This species is frequent in the Crag of Suffolk. It occurs also recent on the coast 

 of Norway, where it was dredged by MM. MacAndrew and Barrett. I believe that I 

 also have had it from the Red Crag of Walton, Essex. 



No. 21. Cythere RETiFASTiGATA, 5j0(?c. ??ou. Plate III, fig. 7. 



INCH. 



Length, -i^ Pliocene : Suffolk. 



Carapace-valve oblong, tapering backwards, rounded at the ends ; raised by three 

 obscure, longitudinal, parallel ridges into an oblong raised plateau, with sudden slopes 

 towards the margins : surface marked with a strong punctation ; the pits circular and 

 regular in their arrangement, coarsest anteriorly. 



A few specimens only of the valves of this species have as yet occurred in my 

 examination of the Suffolk Crag. 



No. 22. Cythere sph^rulolineata, spec. nov. Plate III, fig. 6. 



INCH. 



Length, Jj Pliocene : Suffolk. 



Carapace-valve oblong ; obliquely rounded in front, almost truncate behind ; most 



