244 



PLATE EXPLANATION. 



Fig. 1. Fusuliua secalica 



la. A Bpecimen showing the septal furrows aud the cen- 

 trifugal aperture. 



1 b. Some weathered specimens. 



Fig. 2. Camphophylum torquum 



2 a. Longitudinal view of a portion of a coral. 

 2 b. Cross section. 



2 c. A longitudinal section showing tabulae. 



Some crinoid plates 



Fenestella ? 



? Rliombopera ? 



Hemeitrypa ? 



Archseocidaris spines 



Pugnax uta 



8 a. Ventral valve. 



8 b. Dorsal valve. 



Fig. 9. AmbocjBlia plauoconvexa 



9 a. Dorsal view. 

 9 b. Ventral view. 



9 c. Side view. 



Fig. 10. Reticularia perplexa • 



10 a. Ventral valve. 

 10 b. Dorsal valve. 



Fig. 11. Dielasma bovidines, dorsal view 



Fig. 12. Seniinula argentia 



12 a. Ventral valve showing sinus. 



12 b, f and g. Dorsal views. 



12 c. Dorsal view of a young specimen. 



12 e. Side view. 



12 m. An old specimen. 



Fig. 13. Myalina ? Outline only 



Fig. 14 a, b, c, e. Fragments of an Euomphalus pernodosus 



Fig. 15. Productus punctatus 



15 a. A portion of tlie dorsal valve. 



15 b. Inside of dorsal valve, showing muscular impres- 



