TIIK CARBONIFEROUS SYSTK.M 



247 



,* Lithoxtrotion,* Lonsdaleia,* Phillipsastrea, Syringopora, 

 Clisiophyllnm,* Vibunophyllum,* Cyclophyllum,* Cyathaxonia* 

 Mi flii-tin in, Zaphrentis, Amplexus, Caninia, and Cyathophyllum. 

 None of these survive the Carboniferous period in Europe, though 

 a few occur in the Permian of Asia. 



Echinoderma. Crinoidea are abundant, and their remains 

 often form a large part of the limestones. The chief genera are 



-OROUP OF CARBONIFEROUS FOSSILS (AVo.NIAN). 



a. Michelinia megastoma. 

 li. Amplexus corolloides. 

 . l.itliostrotion attlne. 



</. Terebratula (Dielasma) hastata. 



i. SjiirifiT striatiiM. 



/. Productus seinireticulatus. 



Actinocrinus,* Platycrinus, Ehodocrinus, Cyathocrinus, Poteriocrinus, 

 Amphoracrinus,* and Woodocrinus.* None of them, witL the possible 

 exception of Cyathocrinus, survived this period. Blastoidea now 

 seem to take the place of the Cystideans of the older Palieozoic 

 rocks, the commoner genera being Granatocrinus, Cadaster, and 

 Orophocrinus. Of Echinoidea there are Arch&ocidaris, Palcechinus, 

 and Melonites. 



Crustacea. The only surviving genera of trilobites are 



