PLATE III. 



Fig. 

 1. EstJieria Murchisonia (p. 100). — Right valve; Isle of Skye: X 6 diaiii. 



3, „ „ Smaller specimen : X 6 diam. 



3— 12. „ ,, Portions of the surfaces, mostly of different 



specimens : X 50 diam. 



13. Estheria concentrica (p. 101). — Left valve; Scarborough: X 6 diam. 



14. „ „ Dorsal profile of the same. 



15. „ „ Portion of the surface : X 50 diam. 



16. „ „ Outline of the right valve of the specimen shown 



at fig. 13 : nat. size. 



17. „ „ Outline of a larger specimen: nat. size. 



18. Est/teria elliptica, var. subquadrata (p. 109). — Right valve; Bulverhithe, Sussex: 



X 6 diam. 



„ „ Another specimen (left valve) from 



Bulverhithe : X 6 diam, 



„ „ Portions of the surface of specimens 



from Bulverhithe : X 50 diam. 



„ „ Right valve ; Tunbridge Wells : 



X 6 diam. 



„ Portion of the surface : X 50 diam. 



„ „ Right valves ; East Cliff, Hastings : 



X 6 diam. 



28, 29. „ „ „ Portions of the surfaces of the same : 



X 50 diam. 



19. 







20- 



-22 





23. 







24. 







25- 



-27 





