222 Mr. G. S. Brady on Marine Ostracoda from Tenedos. 



Cythere favoidesj nov. sp. (Plate XV. figs. 5-7.) 



Carapace of the female^ as seen from the side, subquadrangular, 

 higher in front than behind ; greatest height equal to rather 

 more than half the length : anterior extremity well rounded 

 and slightly dentate below the middle ; posterior produced 

 below the middle into a subsquamous flange or bordering 

 process, slightly emarginate above the middle : superior 

 margin a little elevated over the eyes, thence sloping gently 

 backwards in an almost straight line ; inferior gently si- 

 nuated. Seen from above, ovate, widest behind the middle ; 

 extremities obtusely mucronate ; greatest width equal to 

 half the length. Shell of the male much more elongated, 



. the dorsal margin slightly sinuated ; posterior extremity 

 not so deeply excavated above the middle. Surface of the 

 valves marked with a beautiful hexagonally reticulated 

 pattern of delicate raised ridges, and towards the anterior 

 extremity with a broad border, which is crossed by numerous 

 radiating hair-like lines. Length of female ^'^ inch. 



Cy there Speyeri^ nov. sp. (Plate XV. figs. 8-11.) 



Shell oi i\iQ female tumid. Seen from the side, broadly subreni- 

 form, highest in the middle ; greatest height equal to nearly 

 two-thirds of the length : anterior extremity rounded, pos- 

 terior produced into a sort of beak below the middle, and 

 excavated above : superior margin boldly arched, highest in 

 the middle ; inferior slightly sinuated in front of the middle, 

 bending upwards behind. Seen from above, ovate, widest 

 in the middle, broadly mucronate behind, obtusely pointed 

 in front. Shell of the male (?) larger (fig. 8) , the dorsal 

 margin less conspicuously arched, the posterior not so pro- 

 minently beaked. Surface of the valves marked with close 

 and coarsely impressed round puncta ; the ventral margin 

 (of each valve) bearing towards the posterior extremity a 

 single, sharp, downward-pointing spine. Length of female 

 io inch. 



This species is very similar in general appearance to the 

 British C convexa^ and differs chiefly in being very much 

 more tumid : the peculiar ventral spine is also sometimes pre- 

 sent in the British species. 



Cythere dissimiUs^ nov. sp. (Plate XV. figs. 12 & 13.) 



Valves, as seen from the side, subquadrate, highest in front of 

 the middle ; greatest height equal to rather more than half 

 the length : anterior extremity broadly and somewhat 

 obliquely rounded, posterior oblique, deeply excavated, and 



