EXPLANATION OF PLATE L 



Fig. 1. Ckuziana rustica. (Page 33.) 



a. A large but imperfect specimen. 



6. A still smaller fragmeut, showing tUo manner of the breakiug-np of the bodies before 

 tbey became embedded. 

 Fig. 2. Cuuziana Linnarssoni. (Page 32.) 



a. Typical form of the species, showing stipe in place. 



6. Probably the same species as 2 a. 



c. Same as 2 h, side view. 

 Fig. 3. AcuoTiiETA ? subsidua. (Page 34.) 



a. Interior view of ventral valve, enlarged ; details impaired by weathering. 



1). Interior view of dorsal valve, enlarged; similarly impaired by weathering. 



c. Profile view, showing the thickness of the shell and convexity of the valves. 



(1. Internal cast of part of a dorsal valve, probably of the same species. 

 Fig. 4. Ti!ematis pannui-us. (Page 36.) 



a. View of one valve, enlarged. 



h. Fragmeut of the s.ame, magnified, to show character of surface-markings. 

 Fig. 5. HvouTnES piumordiaos ?. (Pago 37.) 



a. View of flattened or dorsal side, a little enlarged. 



6. The same, lateral view. 



c. The same, view of ventral or convex side. 



d. The same, outline of transverse section. 



e. Fragment of rock containing two specimens'partly embedded. 

 Fig. (>. Tracks, probably of a sjiall Crustacean. (Page 49.) 



a. Natural size. 



h. The same, enlarged, showing each track to have been more than once impressed by organs of 

 locomotion of similar shape and size. 



