Gastropod 



(Helico- 



toma) 





Coral 



(Strepte- 



lasma) 



Astylo- 

 tpongia 



Trilobites 

 (Trinucleus) 



(Calymene) 



(Aupbus) 



Crinoid* 

 (Glypto- 



criiiu-i 



Polyzoan 



I'terinaea 



Graptolite 



(Dicho- 



graptus) 



Cyst id 



(Echinos- 



pbaera) 



I.ampshell 



(Platys- 



trophia) 



(Ceraurus) 



ORDOVICIAN MARINE LIFE 



[To j*ct {*(' 



