PLATE I. 



ftg. Page. 



1. Trigonia formosa. Lye., Inferior Oolite 115 



2. ,, tenuicosta Lye., ,, ,, 125 



3. ,, costata, Sow., ,, 124 



4. sculpta, Lye., 124 



5. bella, Lye., ...., 125 



6. ,, striata, Miller, ,, ,, 116 



7. ,, clavellata, Sow., Lower Calcareous Grit. .. 119 



