ACTINOPTERI. 185 



well depressed or disk-like with central portion well pressed 

 down, giving each tooth appearance of shallow cup. Only rims 

 of each tooth covered with smooth enamel. Though most all 

 teeth circular they vary into irregularities of circular design. 

 Marginal teeth all smaller, similar, only with triturating sur- 

 faces less concave, and enameled marginal ring less defined, so 

 enamel extends equally over concave median portions. Succes- 

 sional teeth equally enlarged median as seen from lower sur- 



Fig. 108. — Phyllodus elegans Marsh. Monmouth Co. 



face, as they are above, and marginal teeth also correspondingly 

 reduced. Longest diameter 18 mm. 



The above-described example agrees with Marsh's account, 

 which states the lateral or smaller teeth to be rather few. 



Formation and locality. Known only from the type ascribed 

 to the Eocene greensand at Farmingdale (A. J. Smith), and pre- 

 sented to the Yale Museum, and another example in the Academy 

 from Monmouth County (P. D. Knieskern), most likely from 

 the same horizon, though this is not given. [See comment on 

 page 180, K.] 



