100 KANSAS UNIVERSITY SCIENCE BULLETIN. 



A much less perfect speeimen of this species is No. 174, 

 represented in plate XII, figure 2. It is about two-thirds as 

 large as specimen No. 814, discussed above. The palatine and 

 dental fangs are plainly grooved mesially. The large teeth 

 of the dentary display almost imperceptible striations. The 

 palatine fangs are relatively more slender than those of speci- 

 men No. 814. There is a cephalo-dorsal process, very similar 

 to that of the specimen shown in plate VII, figure 17, over 

 the bases of the palatine fangs. The dentaries appear to be 

 relatively deeper than in the specimen described above, but 

 this is due to the fact that these dentaries are nearly complete, 

 while in the above specimens both dentaries have their ventral 

 margins broken off, and the right one is considerably crushed 

 dorso-ventrally. Unfortunately both operculars prssent the 

 mesial surface. They are very thin at the edges, so that the 

 ridges on the external surface show through. The cephalic 

 end of the subopercular is present, showing the numerous 

 small radiating ridges on the external surface. The para- 

 sphenoid is more nearly complete in this specimen than in any 

 of the others in the collection. There is a deep median dorsal 

 groove near the broad caudal end. This gradually disappears 

 as it approaches the middle of the bone, and is replaced on the 

 cephalic half by a distinct median ridge. The bone is nar- 

 rowest at a point near the middle, gradually becoming broader 

 cephalad. It is just twice as wide at the cephalic end as it is 

 in the middle. The bone marked )nt can not be certainly iden- 

 tified. It differs from the metapterygoid of specimen No. 814 

 in having the concave portion of the margin not a part of i 

 circle, as is the case with that specimen. This bone can not 

 be certainly identified until more specimens have been col- 

 lected. If it should be a metapterygoid this specimen could 

 not be Enchodus doUchus. However, it seems best not to 

 establish a new species for this specimen so long as there is 

 any possibility of it belonging to Enchodus dolichus. ^^ 



Length palatine fang 12 



Length dentary fang 9 



Length articular 55 



Length of alveolar border of dentary 60 



Length of parasphenoid (estimated) 60 



Length of clavicle 55 



Greatest depth of dentary 17 



Greatest depth of articular 18 



Oephalo-caudal measurement of opercular 33 



