38tf 



PALEOZOIC TIME. 



RADIATES. 

 Polyps . 



Cyathophyllum Family. 

 Favosites, of the Madrepore Tribe. 

 Halysites 



Oculina Tribe. 



Astrasa Tribe . 



Acalephs 



Graptolites 



Chsetetes 

 Echinoderms 



Cystideans 



Crinideans 



Blastideans (Pentremites, etc.) 



Star-fishes 



Palseechinoids (including Archaeocidaris) 



Cidaris, Spatangids, etc 



SILURIAN. 



DEV. 



CARD. 



LOWER. 



1 1 



UPPER. 



1 



p. rd. 1 



1 



I 



|S.| c.jp 



MOLLUSKS. 

 Brachiopods 



Lingula Family, gen. Lingulella 



Obolus, Obolella 

 Discina Family, gen. Discina 



Siphonotreta 



Orthis Family, gen. Orthis 



Leptaena . 



Strophomena 

 Rhynchonella Family, gen. Rhynchonella, etc 



Pentamerus 



Camarophoria 



Productus Family, gen. Chonetes. . 



Productus 



Spirifer Family, gen. Atrypa. ...... 



Spirifer 



Athyris , , 



