PLATE XV. 



Fig. 

 1. Trigonia v.-cosfafa, Lye. Inferior Oolite, Rodborough Hill, Stroud. (Page 6(5.) 



Coll. Royal Sehool of Mines. 



~, '5, 4. ,, ,, Smaller examples, Liferior Oolite, Dogger, Blue Wyke, 



Yorkshire. 



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



S, 10. ,, costatula, Lye. Liferior Oolite, near Stroud. (Page SL) Coll. Royal 



School of Mines. 



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



IL „ Skarpiana, Lye. Inferior Oolite (ferruginous), near Nortliampton. 



(Page 79.) 



