X X X 
SYSTEMATIC INDEX. 
ICHTHYODORULITES ( continued ). 
Stichacanthus 
-coemansi 
-tortworthensis 
Oracanthus 
-milleri . 
-pustulosus . 
-pnigcus . . 
Gyracanthus . 
-formosus . 
Aganacanthus 
Erism acanthus . 
- ioncsi . 
-- maior . 
List racan thus 
Byssacanthus 
—— crcnulatus . 
Edcstus .... 
-— heinrichsi . 
-minor . 
-davisi . . 
Cynopodius . . 
-crenulatus . . 
Euctenius .... 
-uni lateralis 
Family CCELOLEPIILE 
Coelolcpis . 
Thelodus . 
-parvidens 
Pago 
133 
133 
134 
135 
135 
138 
13S 
139 
140 
145 
146 
146 
147 
148 
149 
149 
151 
152 
153 
153 
154 
154 
155 
155 
157 
158 
158 
158 
Subclass 0STRAC0DEE.MI 
Order H E T E It OST11ACI 
Family I'TEUASPIDyE 
Pteraspis . 
159 
159 
159 
160 
