497 



Onych. 



Onychodu s sigmoides. (Newberry, Pal. of Ohio, Vol. 1, 



1873, p. 299, pi. 27, fig. 2, 

 (but only the front half of 

 it) the outer side of a jaw 

 a foot long, (natural size 

 in the original, but reduced 

 in the proportion of 5^ to 

 4 in this cut) showing its 

 ornamented surface, and 

 three of the series of large 

 teeth, nearly in their 

 proper position in the life- 

 time of the fish. Delaware, 

 Ohio. Corniferous lime- 

 stone ( Upper Held^) form- 

 ation^ VIII a. Plate 26, 

 j f. 4, shows part of the jaw 

 of a small fish of the same 

 species, natural size ; and 

 f. 3, six of the seven horn- 

 like teeth set for offense 

 and defense, on the front 

 ine where the jaws met 





y\\\ a. 



PcU\Oh}Q. l.piZS. 



