﻿XXX SYSTEMATIC INDEX. 



ICHTHYODORULITES (continued). 



Page 



Stichacanthus 133 



coemansi 133 



tortworthensis ....... 134 



Oracanthus 135 



milleri 135 



pustulosus 138 



pnigeus 138 



Gyracanthus 139 



formosus 140 



Aganacanthus 145 



Erismacanthus 146 



jonesi 146 



major 147 



Listracanthus 148 



Byssacanthus 149 



crenulatus 149 



Edestus 151 



heinrichsi 152 



minor 153 



davisi 153 



Cynopodius 154 



crenulatus 154 



Euctenius 155 



unilateralis 155 



Family CCELOLEPHLE 157 



Ccelolepis 158 



Thelodus 158 



parvidens 158 



Subclass OSTRACODERMI 159 



Order HETEROSTRACI 159 



Family PTERASPHLE 159 



Pteraspis 160 



