376 University Geological Survey of Kansas. 



all of which are firmly anchylosed to the bone. The largest of 

 these, situated just back of the symphysis, has a slightly ex- 

 panded base and is directed inward at the apex. It is strongly 

 striated and stands 8 mm. above the alveolar border. The 

 teeth following are smaller than this one and all are probably 

 of about the same size, except the last, which seems to be 

 smaller than the ones in front of it. They are minutely 

 striated under the microscope. The symphysis is incurved, 

 and seems to have a strong articulation with its fellow on the 

 opposite side by means of the prominent bony tubercles so char- 

 acteristic of this portion of Enchodus. The external alveolar 

 border bears a single row of minute teeth, the exact number of 

 which cannot be determined on account of the greater part of 

 them being broken away. 



* 



Enchodus petrosus. Plate LXX, fig. 11. 



Enchodus petrosus Cope, Hayden's Bull. U. S. Geol. Surv. Terr. No. 2, 

 p/44; Cret. Vert. West, p. 238. 



This species is represented by the palatines of numerous in- 

 dividuals and a small portion of one ectopterygoid. 



The palatine is dense in texture and supports a very large 

 tooth at the anterior extremity, which is directed downward 

 and slightly forward. The anterior portion of this tooth pre- 

 sents a sharp cutting edge, which extends from the apex to 

 near the base, along the sides of which the enamel is nearly 

 smooth, while posteriorly it is covered with conspicuous vertical 

 striae. Posterior to this tooth there are a number of curved 

 lines or scars formed in the replacement of this tooth, back of 

 which the border is slightly carinate. The upper and posterior 

 portions are very irregular. 



Enchodus dirus. Plate LXX, fig. 14. 



Phasganodus dirus Leidy, Proc. Acad. Nat. Sci. Phil., 1357, p. 167. 



This species was first described by Doctor Leidy, 134 from a 

 mutilated dentary bone from the Cretaceous deposits of Dakota, 

 as Phasganodus dirus, making the specimen the type of a hitherto 



134. 1. c, p. 167. 



