PLATE V. 



PAGE. 



Ph-enopora (Ptilodictya) expansa 114 



rig. 1. View of a portion of a frond, natural eizp, showing a portion on the right, which presents the 

 outer surface, the larger part showing the inner face of the opposite lamina). 



ReTEPORA ANGUIiATA? Ill 



Pig. 2. View of a fragment of a frond, natural size, 

 a. An enlargement of the stiiated surface. 



4. A still further enlargement of a portion of the celluliferous face, showing the form and 

 arrangement of the cell apertures. 



StICTOPORA MAGNA 112 



Fig. 5. View of a fragment of a stipe which has been split through the center and presents the 

 inner face of the laminae. Jf atural size. 

 6. An enlargement of a portion to show the arrangement of the lines of cells as presented on 

 the exposed surface. 



Clathropora Clintoneksis 113 



Fig. 7. View of a frond, natural size, showing the large. iiTegularly formed perforations. Many of 

 the specimens observed have them still larger in proportion to the breadth of the branches 

 than in this one. 



RhINOPORA FRONDOSA 112 



Fig. 8. View of a fragment, natural size, showing the arrangement of the macnlae and grooves on 

 the surface. 

 9, An enlargement of one of the maculte, showing the clustering of larger pores. 



Strophomena patenta 115 



Fig. 10. View of the exterior of a ventral valve, as obtained from an impression left on the surface 

 of the stone, reversed by taking a cast in gutta-percba, giving the true form of the shell 

 in the figure. 



I Cypricarditj:s ferrugineum 116 



Fig. 11. View of the left valve, as obtained by a gutta-percha impression in the rock. The valve has 

 been slightly injured by compression on the anterior end. 



Plburotomaria inexpbctans 117 



Fig. 12. View of one of the specimens used in description, the surface-markings being Indicated 

 from another otherwise less perfect individual. 



Orthoceras Jamesi 118 



Fig. 13. View of the specimen described, enlarged to three diameters. 



Ill^nus Daytonensis 119 



Fig. 14. View of tfaeiglabeUa and fixed cheeks of a specimen of the species. 



15. View of a small pygidium associated with glabellse of the form of the above. 



16. View of a larger pygidium of the same form as fig. 15. 



