72 Bulletin American Museum of Natural History. [Vol XIX, 



Another process is considerably in front of the one just de- 

 scribed, and is directed upward. Its posterior face is flat 

 and smooth. The inner face of the lower and hindermost 

 process looks upward and inward, and is slightly convex and 

 smooth. It connects the two articulatory surfaces which are 

 directed backward and form a third surface. A thin per- 

 pendicular plate of bone has extended backward from the 

 inner border of the anterior articular surface near the base 

 of the posterior process, but it is now broken away. It is 

 seen in the figure of the corresponding parts of E. scbvus. It 

 appears evident that the posterior process in E. petrosus has 

 been distorted, so that its upper surface is directed more out- 

 wards than in life. For the same reason, it is now lower 

 than originally. This is indicated by another specimen. 

 Through these smooth articulatory surfaces the palatine must 

 have had a very free movement on the prefrontal. 



Portions of the palatine fangs of an Enchodus from the 

 Fox Hills Group of New Mexico are not distinguishable from 

 those of E. petrosus. (Cope, Amer. Naturalist, XXI, 1887, 

 p. 566.) 



Enchodus dolichus Cope. 



Enchodus dolichus Cope (E. D.), Vert. Cret. Form. West, 1875, pp. 

 239, 278, 300, pi. liv, figs. 8, 8a; Proc. Amer. Philos. Soc. XXIII, 

 1885, p. 3. — LooMis (F. B.), Palaeontogr. XLVI, 1900, p. 279, 

 pi. xxvii, figs. 16, 17. — Stewart (A.), Univ. Geol. Surv. Kansas, 

 VI, 1900, p. 377, pi. Ixx, fig. 12. — Woodward (A. S.), Cat. Foss. 

 Fishes, IV, 1901, p. 204. — Hay (O. P.), Bibliog. and Cat. Foss. 

 Vert. N. A. 1902, p. 389. 



Of this species the type, a fragment of the palatopterygoid, 

 is in the Museum and bears the number 1820. There are like- 

 wise considerable portions of three skulls, including those 

 described by Cope on page 300 of his 'Vertebrata of the 

 Cretaceous Formations of the West.' One of these skulls, 

 Cope's "No. I," No. 1837 of this Museum, is represented by 

 Fig. 52. It displays both palatines, the right much out of 

 its natural position, the left pushed backward about 25 mm. 

 Its great fang is crossed by the anterior end of the ectoptery- 

 goid. The long teeth of the latter bone are well shown. 



