400 



PALAEOZOIC TIME. 



RADIATES. 

 Polyps 



Cyatbophyllum Family. 



Favosites (Acalephs?). 



Halysites (Acalephs?). 



Astra?a, Madrepora, and Caryophyllia 

 Families. 



Acalephs. 



Graptolites. 



Chastetes 

 Echinoderms 



Cystideam 



Crinideans. 



Blastoids (Pentremites, etc.). 



Star-fishes 



Palasechiuoids (including Archseocidaris) 



Cidarids, Spatangids, etc. 



SILURIAN. 



DEV. 



j CARB. 



LOWER. 



UPPER. 





1 



P. Pd. 



i 





| S |0. 



p 



MOLLUSKS 

 Brachiopods 



Lingula Family, gen. Lingula 



Obolus, Obolella, 

 Disciua Family, gen. Discina, 



Sipbonotreta. 

 Ortbis Family, gen. Orthis 



Leptsena, 



Strophomena 

 Rbynchonella Fam. gen.Rhyncbonella.etc 



Pentamerus 



Camaropbor 

 Productns Family, gen. Cbonetes 



Productus 

 Spirifer Family, gen. Atrypa 



Spirifer 



Atbvris 



