PLATE XVI. 



Fig. 



1. Trigonla Leckenhyi, Lye. Supra-Liassic Sandstone, Robin Hood's Bay, Yorkshire. 



(Page7L) Coll. VVoodwardian Museum, Cambridge. 



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



3. ,, Sharpiana. Dogger, Blue Wyke. (Page 79.) 



4. 5, 6. ,, „ Same species (ferruginous). Inferior Oolite, Northamptonshire. 



7. „ paucicosta. Lye. Kelloway Rock, Cay ton Bay, near Scarborough. 



(Page 57.) 



8. ,, Williamsoni, Lye. Kelloway Rock, Cayton Bay, near Scarborough. 



(Page 53.) 



9. 10, 11. undulaia. From. Great Oolite, near Bourn, Lincolnshire. (Page 77.) 



