PLATES AND EXPLAXATIOXS 



CORALS. 



PLATE 1. 



(For reference to the species, sec Explanatio)) of Piute 8.) 

 Favosites tubeeosa var. 



The figure represents the lower side of a convex, sub-hemispheric specimen from which the 

 epitheca has been removed by weathering, revealing the cells with the mural pores. The peculiar 

 feature of the partial diaphragms which are represented in spiniform processes, has been to a preat 

 extent destroyed, but is seen in some places, and especially on the left of the figure. Upper Hel- 

 rierberg Limestone, Cayuga, Ontario. 



