SUPPLEMENT, PLATE XXI. 

 Fig. 



1 — 7. Waldheimia sub-numismalis, Dav. 1. A large thick specimen. Middle Lias, 



near Bradford Abbas, Dorsetshire. Collection of Mr. 

 D. Stephens. 2. Middle Lias, Chideock, near Char- 

 mouth, Dorsetshire. School of Mines. 3, 6, 7. 

 Different ages. Same locality. Collection of Mr. 

 Walker. 4. A thick specimen. Middle Lias, Am. 

 marginatus zone, Church down, Gloucestershire. 5. A 

 specimen showing the loop. Museum of the School 

 of Mines. (P. 162.) 

 8, 9. ,, numismalis, Lam. Lower Middle Lias, Churchdown, Gloucester- 



shire. 9. An elongated specimen from Am. Jamesoni 

 zone, lowest portion of Middle Lias, near Chelten- 

 ham. Mr. Deslongchamps refers these specimens to 

 Wold, cor., Lam., but I think them variations in 

 shape of W. numismalis. Collection of author. 

 (P. 162.) 



10 — 15. „ indentata, Sow. 10. Erom Sowerby's type in British Museum. 



Middle Lias, near Banbury. 11. Another specimen. 

 Same locality. Collection of Mr. Beesley. 12, 13. 

 Two modifications in shape, showing the passages 

 from the indentated front to the non-indentated. 

 Middle Lias (Am. spinalus zone), Churchdown, 

 Gloucestershire. 14. A wide specimen from Middle 

 Lias, near Banbury." All the specimens figured in 

 this Supplement from the Liassic deposits of Church- 

 down were collected and kindly given to me by the 

 Rev. E. Smithe. (P. 159.) 



16 — 18. ,, Maria, d'Orb. 16 and 16 ad. A typical example from the Middle 



Lias (Am. margaritatus zone) of Churchdown, Glou- 

 cestershire. 17. Middle Lias, South Petherton, near 

 Ilminster. 18. Erom Charmouth, near Lyme Regis, 

 and Collection of Mr. J. F. Walker. (P. 158.) 



19. ,, cornuta, Sow. A very large example. Middle Lias, Chideock. 



Museum of the School of Mines. (P. 158.) 



20. „ quadrif, da, Lam. After E. Deslong., to show the loop. (P. 157.) 



21. 22. ,, (Ter.) bullata, Sow., to show the dark longitudinal line extending 



from the umbo to about two thirds of the length of 

 the valve, indicating the presence of an internal 

 septum and Waldheimia loop. Fuller's Earth, What- 

 ley, near Frome, and Collection of Mr. J. F. Walker. 

 (Pp. 138 and 187.) 



