PLATE III. 



Fig. 



1. Estheria MarcJmonim (p. 100). — Right valve; Isle of Skye : X 6 diam. 



2. ,, ,, Smaller specimen : X 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. Estheria elliptica, var. subquadrata (p. 109). — Right valve; Bulverhithe, Sussex: 



X 6 diam. 



19. „ ,, „ Another specimen (left valve) from 



Bulverhithe : X 6 diam. 



20 — 22 ,, „ „ Portions of the surface of specimens 



from Bulverhithe : X 50 diam. 



23. „ „ „ Right valve; Tunbridge Wells : 



X diam. 



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



25—27,, „ „ Right valves; East Cliff, Hastings: 



X diam. 



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



X 50 diam. 



