﻿PLATE VII. 



Fig. 



1. Triyonia Pellati, Mun, Ch. Adult example, Osraington Bay, near Weymouth. 



Kimmeridge Clay. (Page 41.) 



2. „ „ Another example from the same locality and formation. 



3. „ complanata. Lye. Killoway Rock, Cayton Bay, near Scarborough. 



(Page 49.) 



4. 5. „ impressa, Sow. Slate, Stonesfield, Oxfordshire. (Page 46.) 



6. „ irregularis, Seeb. Young specimen, Oxford Clay, Weymouth. (Page 39.) 



