190 



H. HICKS ON THE SUCCESSION OP 



Table showing the Range of Genera from the " Longmynd Group " to 

 the " Bala Group " in Wales. 



Genera. 



Ph 



o 

 u 



O 



B 



bD 



O 



2 



O 

 d 



s 



bO 



03 



.13 



bD 



a 



■a 



u 



O 



1 



PI 



1 



bo 



Si 

 <D 

 Pi 



P 



Pi 



O 

 U 



o 

 c 



-a 



03 



a 



bb 



'5 



3 



bb 

 © 



Si 

 CD 



s 



.bi) 



"8 



Si 

 0) 



P^ 

 P 



°3 



CO 



Si 

 CO 



'3 

 PI 



03 



"3 



a 



03 



Si 

 CO 



Pi 

 Pi 



p 



Pi 



o 



03 



Ehizopoda. 

 Protospongia 



X 



X 

 X 



X 

 X 



x 



x 



x 

 * 



? 

 X 



X 

 X 



X 

 X 



X 



X 

 * 



X 

 * 

 X 



X 



? 



X 



X 

 X 

 X 

 X 



1 

 1 



X 



X 

 X 



X 



X 



X 

 X 



? 



X 



X 



X 

 X 

 X 

 X 



? 



X 



* 



X 

 X 



X 

 X 



? 



X 

 X 



X 



X 

 X 



X 

 X 



X 

 X 



X 



Ischadites 



Hydrozoa. 



Dictyonema 



Callograptus 



Dendrograptus 



Ptilograptus 



Trigonograptus 



Phyllograptus 



Didymograptus 



Tetragraptus 



Clemagraptus 



Nemagraptus 



Dicellograptus 



Climacograptus 



Diplograptus 



Grlossograptus 



Actinozoa. 



Favosites = 



Monticulipora 



Stenopbra 



Echinodermata . 



Dendrocrinus 



Palasterina 



Annelida. 



X 



X 

 X 



X 





Histioderma (Ireland) . . . 



Helmintholites 



Haughtonia (Ireland) ... 



Chondrites 



Cr uziana 



Nereites 



Palaeochorda 



Scolecoderma 



Serpulites 



Myrianites 





