PLATE IV. 



PtJSTULOPORA. 



Figure 1. Pustulopora prohoscidea, . 



la, part of zoarium ; lb, ocecial dilatation, 



„ 2. Pustulopora regularis, 

 2a, terminal fork, 



„ 3. Pustulopora deflexa, 



3a, bifurcation of zoarium. 



,, 4. Pustulopora prohoscidioides, 



4a, 4&, two portions of the zoarium, 



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