WELLBURX : FISH REMAINS IN THE LIMESTONE SHALES. 177 
Another tooth — seen in impression — shows that the central 
cone or prominence was moderately elevated, and that it had a 
well marked ridge running across it from anterior to posterior 
margin, and still another fragment of a tooth shows that the 
root was large and of an open porous structure. 
Form, and Loc. : Limestone Shales (Yoredale), Crimsworth 
Dean. 
SuB-CLASS : Teleostomi. 
Order : Actinopterygii. 
Sub-order : Chondrostei. 
Family : Palseoniscidse. 
Genus : Elonichthys Giebel, 1848. 
E. Aitkeni Traquair, 1886. 
Fragmentary remains of this species are recorded by the 
late Mr. James Spencer, of Halifax"^. 
Form, and Loc: Limestone Shales (Yoredale), Crimsworth 
Dale. 
I cannot conclude without expressing my best thanks to 
Dr. Hind for the privilege of describing the specimens in his 
collection. 
*Proc. Yorks. Geol. and Polytec. Soc, Vol. XIII., Pt. IV., 1898. 
