PLATE VI. 



Fig. 

 1, 2, Bairdia subdeltoidea, p. 52. 



1 a. Perfect, right valve upwards 

 1 b. Perfect, dorsal aspect 

 2. Perfect, right valve upwards, 

 anterior and posterior margins.) 



. x 25 



. x 25 



(Showing denticulations at the 



. x 25 



Copenhagen Fields, 

 London. 



3. Cytheridea perforata, var. insignis, p. 46. 



a. Right valve, outside : imperfect 



b. Right valve, posterior aspect 



c. Right valve, dorsal aspect 



x 25 

 x 25 

 x 25 



Copenhagen Fields, 

 London. 



1, fi. Cy there scrobiculoplicata, p. 33 

 4. Left valve, outside 

 (i a. Left valve, outside 

 6 b. Left valve, hinge-line 

 6 c. Right valve, hinge-line 

 6 d. Perfect, dorsal aspect 



25 



25 



25 

 25 



25/ 



Copenhagen Fields, 

 London. 



Cy there triangularis, p. 25. 



a. Left valve, outside 



b. Left valve, dorsal view 



c. Left valve, hinge-line 



d. Perfect, anterior aspect 



e. Right valve, hinge-line 



f. Right valve, dorsal aspect 



g. Right valve, outside 



X 25 

 X 25 

 X 25 

 x 25 

 X 25 

 x 25 

 X 25. 



Copenhagen Fields, 

 London. 



7, 8. Cythereis Bowerbankiana, p. 38. 

 7. Left valve, outside 

 8. Left valve, outside 



9. Cythere scrobicidoplicata, var. recta, p. 34. 

 Left valve, outside 



X 25 "i Copenhagen Fields, 

 X 25 J London. 



X 25 East Woodhay, Hampsh. 



10, 11. Cytheridea Mulleri, p. 41. 

 10 a. Left valve, outside 

 10 6. Perfect, dorsal aspect 

 1 1 . Left valve, outside 



x 25 } C ° lwe11 Ba ^ 

 x 25 Woolwich. 



12. Cytheridea 'Mulleri, var. torosa, p. 42. 

 Right valve, outside . 



X 25 Woolwich. 



1 This and the subsequent figures of species from Colwell Bay were introduced among the Woolwich species under the 

 mistake explained at p. 26. 



