84 



CATALOG OF FOSSIL FISHES IN THE MUSEUM 



served, but even considering the greater po»-tion of it to be missing, 

 or indeed that when complete it was as long as the functional portion, 

 we still have a mandible of very distinctive appearance and unlike 

 that of any other known arthrodire. It represents a dolichocephalic 

 type of arthrodire, comparable in this regard with Stenognathus. It 

 resembles this genus also in the absence of the secondary cusp of 

 the mandible. It also has some resemblance to the mandible of 

 Diplognathus. 



■*jf-A„' i.i«v js-'^"* 



Fig. 27. Machaerognathus woodwardi, n. g., n. sp. Right Mandible, LACiaNG 

 Posterior Extremity. X ^ 



^, outer view; 5, inner. Type. E 1935. 



Copanognathus crassus, n. gen., n. sp. 



(PL 22, figs. 2, 3, 4; text-fig. 28) 



E 1944 Type. — Left mandible. Length, 175 mm.; depth at middle, 

 55 ; length of tritoral area, 68. 



Formation and Locality. — Conodont bed (Genesee); Eighteen Mile 

 Creek, near North Evans, Erie County, N. Y. Collected by W. L. 

 Bryant. 



Mandible resembling that of Dinomylo stoma; with a tritoral urea 

 occup5dng about I of its length; straight fore-and-aft, not sigmoid; 

 outer face convex, inner almost flat. Functional area not demarcated 

 either on outer or inner face from the blade portion. Tritoral area 



