﻿PLATE III. 



Fig. 



1. Tiit/onia perlata, Kg. Coral Rag, Pickering ; the rows of costge are fewer than is 



usual. (Page 22.) 



2. „ „ The same formation and locality ; the largest specimen known. 



3. „ „ Young specimen from the same locality. 



4. 5 G, 5 b, 0. spinulosa, Y. and B. Inferior Oolite (Dogger), Bine Wyke, Yorkshire. 



(Page 44.) 



7. „ corallina, D'Orb. Coralline Oolite, Pickering. (Page 45.) 



8, 9, 11. „ Young specimens, Coral Rag, Steeple Ashton, Wilts. 



10, r/. „ Gnesbachijliyc. Cornbrash, Rushden, Northamptonshire; natural size. 



(Page 34.) 



10, h. „ „ The same specimen magnified. 



