Upper Silurian Fossils. 97 



FIG. 24. 



Arachnophyllum typus. 



Cyathophyllum truncatum. 



Cyrtia exporrecta. 



Rhynchonella navicula. 



Petraia bina. 



Omphyma turbinata. Orthoceras annulatum. 



Group of Upper Silurian fossils. 



