278 

 Enchodus petrosus, Cope. Plate LIV, ligs. 4, 5. 



Hayden'a Bulletin of the United States Geological Survey of the Territories, No. 2, p. 44. 



Niobrara group of Kansas. 

 Enchodus dolicuus, Cope. Plate LIV, tig. 7. 



Siqirti, p. 240. 



Niobrara Cretaceous of Kansas 



Enchodus oxytomus, Cope, sp. nov. 



. Represented by one of the long teeth from the anterior extremity of the 

 premaxillary or dentary bones. It differs from other species of the genus in 

 the extent to which the posterior cutting-edge is prolonged downward toward 

 the base of the tooth, nearly equaling in this respect the anterior edge. As 

 in all other Encliodi, the cutting-edges are not opposite, and a section of the 

 base is unsymmetrical. Cementum mostly smooth. Crown rather broad for 

 its length, which is below the average of the Cretaceous species. 

 Clays below Cretaceous, No. 4, New Jersey. 



Enchodus teir/ecus, Cope, sp. nor. 



Established on various teeth from the greensand of Delaware and New 

 Jersey. The elongate anterior teeth are narrow and slender; the greatest 

 diameter at the base being at right angles to that of the upper part of the 

 crown. The posterior side is, as usual, much more convex than the anterior, 

 and the two faces are separated by cutting-edges, both of which extend to 

 the base of the crown. A shallow groove runs just behind each cutting-edge 

 to the base, giving the latter an unsym metrical figure-8-form of section. The 

 anterior face is but little convex, and is perfectly smooth ; the posterior is 

 very convex, and is marked with sharply defined grooves, about half-way to 

 the apex from the base, between the lateral shallow grooves. Fifteen may 

 be counted from side to side. Length of crown, m .03O ; median diameter, 

 m .005; basal diameter, CP.007. 



Cretaceous, No. 4, Delaware and New Jersey. 



Enchodus calliodon, ('ope. 



I., c . [>. 354. 



Niobrara epoch oi the Smoky Hill River. 



