﻿PLATE XV. 



Fig. 



1. Trir/onia v.-cosfafa, Lye. Liferior Oolite, Rodborough Hill, Stroud. (Page 6(3.) 



Coll. Royal School of Mines. 



2, •"?, 4. „ ,, Smaller examples, Inferior Oolite, Dogger, Blue Wyke, 



Yorkshire. 



5, 6, 7. ,, ampta. Lye. Liferior Oolite, Collyweston slate. (Page 70.) 



8, 10. ,, costatula, Lye. Liferior Oolite, near Stroud. (Page SI.) Coll. Royal 



School of Mines. 



'J- „ ,, A smaller specimen, from the same formation and locality. 



1 L „ S/utrpiana, Lye. Inferior Oolite (ferruginous), near Northampton. 



(Page 79.) 



