94 KANSAS UNIVERSITY SCIENCE BULLETIN. 



stricted. The diameter of the larger end is equal to the great- 

 est diameter of the palatine fang near the base. The quad- 

 rate is very similar to that of other species. The basioccipital 

 and the exoccipitals share equally in the formation of the oc- 

 cipital condyle. 

 Measurements : 



mm. 



Width of skull across sphenotics 45 



Width of skull across pterotics 39 



Width of the shallow depression on dorsal surface of the skull 



along the line s-s 17 



Width of the occipital condyle 8 



Greatest depth of the palatine 11 



Greatest diameter of the palatine fang at middle 2..') 



Length of the palatine fang 18 



Greatest width of the ethmoid 12 



Length of the dentary 90 



Estimated depth of the dentary 25 



From the articulation of quadrate to palatine fang 90 



Length of the articular 65 



Greatest depth of the articular 22 



Length of the suspensory phaiyngeal ' 8 



Specimen No. 51, represented in plate X, figure 1, shows 

 the teeth of the right dentary, except the fang, nearly com- 

 plete. The second and fourth of these have their points 

 broken off. The external surface of the dentary is exposed. 

 Most of the symphysial portion is missing, but the impression 

 left in the matrix indicates that the fang was strongly grooved 

 mesially. The opercular and subopercular have retained their 

 position relative to each other, but have been moved backward 

 and upward from their position relative to the preopercular. 

 Their characters have received attention in the discussion 

 above of the cotype (No. 379) . The dentary has been reversed. 



Measurements : ^^^ 



Length of the dorsal edge of the dentary 85 



Length of the dental fang 13 



Length of third tooth caudad to the fang 8 



Depth of the mandible at the caudal end 27 



Caudo-cephalic measurement of the opercular 37 



Specimen No. 812, shown in plate X, figure 2, displays the 

 mesial view of the alveolar border of a dentary, a pair of 

 palatines without fangs, a pair of pterygoids, and a pair of 

 quadrates. The bases of the teeth are swollen much the same 

 as in other species. The statement in Stewart's description 

 of the type, that the base of the dentary fang "does not seem 



