PLATE VIII. 



Fig. 



1. Trigonia ingens, Lye. Neocornian formation, Downham, Norfolk. Adult example ; 



impression from an external cast, in coarse sandstone. 

 (Page 24.) 



2. a, b. ,, „ Internal mould, size somewhat reduced, Downham, Norfolk. 



3. „ Young example, with the test preserved, Downham, Norfolk. 



4. „ BupeUensis, D'Orb. Kelloway Rock, Cayton Bay, near Scarborough. 



(Page 28.) 



5. „ corallina, D'Orb. Adult example, Coral Rag, Pickering (Page 45.) 



