400 



PALAEOZOIC TIME. 



RADIATES. 



Polyps 



Cyathophyllum Family 



Favositcs (Acalephs?) 



Halysites (Acalephs?) 



Astraa, Madrepora, and Caryophyllia 

 Families 



Acalephs 



Graptolites 



Chaetetes 



Echinoderms 



Cystideans 



Crinideans 



Blastoids (Pentremites, etc.) 



Star-fishes 



Palajechincids (including Archseocidaris) 



Cidarids, Spataugids, etc 



MOLLUSKS. 



Brachiopods 



Liugnla Family, gen. Lingula 



Obolus, Obolella 



Discina Family, gen. Discina 



Siphonotreta 



Orthis Family, gen. Orthis 



Leptsena 



Strophomena 



Rhynchonella Fam. gen.Rhynchonella,etc 



Pentamerus 



Camarophoria 



Productus Family, gen. Chonetes 



Productus 



Spirifer Family, gen. Atrypa 



Spirifer 



Athyris 



