90 KANSAS UNIVERSITY SCIENCE BULLETIN. 



section of which cuts the long axis of the beams at an angle of 

 45°. Since the caudal edge of these processes is ventral, and 

 the grooves on the dorsal side of the palatines are very nearly 

 at right angles to the palatine fangs, it is plain that when the 

 proces.ses are in place in the grooves on the palatines the long 

 axis of the fangs will make an angle of 135° with the long axis 

 of the ethmoid, and hence the dorsal surface of the skull, since 

 these coincide. In plate VI, figure 3, etii, the broken line from 

 eth points to the base of the process which articulates with the 

 right palatine. The maxillary (fig. 3, mx) is shown almost 

 complete in the same figure. It is enlarged at the cephalic end 

 and sends a process upwards, which in all probability met its 

 fellow of the opposite side in the median line. The caudal half 

 of this bone is a slender bar reaching to the caudal end of the 

 dentary. The palatine could not be distinguished from that of 

 Enchodus petrosus were it not for the fang, which has a differ- 

 ent shape. The palatine and dentary fangs are bent forward 

 at the apex. The teeth of the pterygoid and dentary are all 

 flexed backward about one-third their distance from the bases, 

 and forward again near their apices. This bending is slight, 

 but easily observable. The metapterygoid and mesopterygoid 

 are represented. The former is shaped much like that of E)i- 

 chodus amicrodus (pi. X, fig. 3) . The preopercular is expanded 

 at the ventral end and tapers to a point at the dorsal end. The 

 ventral end is marked distinctly by radiating ridges. Encho- 

 dus dims differs from Enchodus amicrodus in not having dis- 

 tinct tuberculated ridges on the external surface of the den- 

 tary; the ratio of the diameter of the palatine fang to its 

 length is more than twice as great as that of Encliodus amicro- 

 dus, i. e., the palatine fang of Enchodus amicrodus is only one- 

 fourth as stout as that of Enchodus dims, the fang of the 

 former being slender, straight, and fluted mesio-caudally. 



The preopercular is in position. The hyomandibular fits 

 into a deep groove on its cephalic border. There is a cone- 

 shaped process on the cephalic border near the ventral end, 

 which fits into a deep groove on the caudal edge of the quad- 

 rate. Only the cephalic edge of the opercular is present. The 

 subopercular is almost complete. It has numerous ridges radi- 

 ating from the point of articulation with the hyomandibular. 

 The relation of the premaxillary to the palatine is well shown 

 in the left view of this specimen. (See pi. VI, fig. 4.) The 



