98 CATALOG or FOSSIL FISHES IN THE MUSEUM 



Genus Acanthaspis Newberry 



This genus is known by isolated plates, usually with a spine 

 attached to one side. They occur in the Devonic of both Europe and 

 America — in America typically in the Mid Devonic limestone of Ohio, 

 New York and Wisconsin. 



There has been considerable discussion as to the affinities of these 

 plates; but from the researches of Traquair,^' and Smith Woodward,^ 



Fig. ss- Acanthaspis armata Newtberry. A Pair of An tero- Ventrolaterals, 

 EST Inner View. X §. E 1857 



it appears that they are the antero-ventrolaterals of a ventral armor 

 somewhat similar to that of PhlyctcBnaspis, and hence that they 

 represent an Arthrodire. 



Recently Eastman^^ has advocated the view that they belong with 



"The Devonian fish fauna of Spitzbergen. Ann. Mag. Nat. Hist., i, 15, pis. i-iii, 1S91. 



^2 Further contribution to the knowledge of the Devonian fish fauna of Canada. Geol. Maga- 

 zine, [3], ix, 4S1-485, pi. xiii, 1892. 



On the Devonian fishes of Campbelltown and Scaumenac Bay in Canada, No. 2. Geol. 

 Magazine, [3], x, 145-149, 1893. 



« Devonian fishes of Iowa. Ann. Report Iowa Geol. Survey, xviii, 144, igoS. 



