HOLOCEPHALI. 



129 



Formation and locality. Only known from' an imperfect man- 

 dibular ascribed to the "Greensand of New Jersey No. 5" [the 

 Hornerstown marl, K.] and now in the American Museum at 

 New York. 



Edaphodon sp. 



Right palatal depressed, a trifle more than twice as long as 

 wide, and depth about one-third length. Upper surface with a 

 deep wide gutter ending in a deep pit, anterior to which area is flat- 

 tened and horizontal. Side flattened and sloping obliquely out. 

 Lower surface with conspicuous prominence in front or crest, 



Fig. 79. — Edaphodon sp. New Jersey "greensand." 



sloping steeply forward. Apex of crest gives rise to anterior den- 

 tal area, latter elongated, scarcely wider posteriorly, though at 

 that point deeply concave, and extending slightly behind front of 

 inner posterior dental area. External posterior dental area 

 arises very slightly behind front end of posterior inner dental 

 area. Inner surface of upper maxillary entirely flat. Length 

 70 mm. 



9 GEOIy 



