BUFFALO SOCIETY OF NATURAL SCIENCES 83 



E 2165 Beak of a left mandible of about the same size as the type 

 (PI. 27, figs. 4; 4a). It shows well the symphyfeeal den- 

 ticles; these are six in number, are directed upward at an 

 angle of 45°, and extend about half way down the sym- 

 physis. The area below them is un den tided and out- 

 wardly rounded. The bases of the 6 denticles occupy 

 a space of 21 mm. 



Machserognathus woodwardi, n. gen., n. sp. 



(PL 21, figs. I, la, lb; text-fig. 27) 



E 1935 Type. — A right mandible, lacking the posterior extremity. 

 Length as far as preserved, 165 mm.; depth at middle 

 of functional area, 30; height of beak, 27. 



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

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

 Bryant. 



Mandible long and slender, the blade portion apparently much 

 shorter than the functional portion. Oral margin a cutting edge 

 without denticles, worn on the outer face as in Dinichthys; with 

 a strong beak directed upward and outward in a straight line and not 

 recurved. Depression between beak and beginning of sectorial edge, 

 broad and shallow. No secondary cusp back of the beak. Func- 

 tional portion not sharply demarcated from blade portion but gently 

 merging into it. Depth of functional area at its middle, contained 

 about 3f times in its length. Mandible viewed from above, slightly 

 sigmoidal in section, its front half rather strongly convex outward. 



[Machairos, knife; gnathos, jaw.] 



We take pleasure in dedicating this species to Dr. Arthur Smith 

 Woodward, Keeper of the Department of Geology in the British 

 Museum, as an expression of admiration for his work in paleich- 

 thyology, as well as a token of appreciation of the many courtesies 

 shown to the authors on their respective study visits to the British 

 Museum. 



Remarks. — This mandible differs from that of Dinichthys and all 

 other arthrodires by the imusual length of the f imctional portion as 

 compared with the inserted portion, and by the form of the element 

 as a whole. The blade, or inserted portion, is not completely pre- 



