658 PROCEEDINGS OF THE ACADEMY OF [Dec, 



proportions they approach M. peracutus. Location and Horizon — 

 Oriskany sandstone; Manlius and Britton's Quarry, Onondaga County, 

 New York. 



The writer believes that it is not out of place to append here the 

 following notes concerning the range and distribution of the described 

 species of Machceracanthus. 



Maohaeraoanthus peracutus Newb. 



Middle Devonian. Columbus and Delaware limestones of Ohio, 

 Onondaga' (Corniferous) limestone of New York. 



Maohaeraoanthus suloatus Newb. 



Middle Devonian. Ohio. Onondaga limestone of Xew York. 

 Gaspe sandstone of Canada. 4 



Maohaeraoanthus major Newb. 



Middle Devonian, Columbus and Delaware limestones of Ohio. 



Maohaeraoanthus longaevus Eastman. 



Middle Devonian. Hamilton of Xew York. 



Maohaeraoanthus bohemicus (Barramle). 



Devonian of Europe. 



The specimens from the vicinity of Syracuse definitely extend the 

 range of the genus to the Oriskany sandstone and, as stated before, 

 probably represent a new species. We know, however, practically 

 nothing of the morphology of Machceracanthus, and if, as has been 

 suggested, it is a gigantic Acanthodian, the probability is strong that 

 even in one individual spines might have occurred whose curvatures 

 and cross sections differed greatly. 



In addition to the fossils assignable to Machceracanthus, the Manlius 

 locality has yielded other though much less satisfactory fish remains. 

 These are so poorly preserved that little can be said of them beyond 

 the fact that they present the appearance of badly weathered Arthro- 

 diran plates. 



Note on the Plates of Dinichthys hahnodeus (Clarke)? — The structure 

 of the abdominal armor in Coccosteus and especially in C. decipiens 

 Ag. has been well understood for many years. The other genera of 

 Arthrodires, however, seldom furnish us with anything but scattered 

 plates, and this is more particularly true of the ventral shield. In 



4 New York State Museum Memoir 10, p. 191. 



