102 KANSAS UNIVERSITY SCIENCE BULLETIN. 



pitted as though it had borne many small denticles. It is 

 probably one of the basibranchials. The vertebra are irregu- 

 larly grooved laterally and constricted mesially. The proximal 

 third of both pectoral fins is present, but dissociated. The 

 laterally compressed palatine fang is lightly striated mesio- 

 caudally and has the cephalic cutting edge unusually sharp. 

 The caudal end of the skull is present, but badly ci'ushed. The 

 small supra-occipital crest is preserved entire. 

 Measurements : 



mm. 



Width of the caudal end of the skull 60 



Length of the supraclavicle 70 



Length of clavicle 75 



Length of palatine fang 23 



Length of alveolar border of the dentary 120 



Length of hypocoi'acoid 80 



Length of centra 15 



Length of the dentary fang 17 



Specimen No. 816, plate XIII, figure 2, represents a pair of 

 mandibles, fragments of the palatine, pterygoid, and quadrate. 

 It displays no dissimilarity from specimen No. 814, described 

 above, except that it is somewhat smaller. 

 Length of the mandible 135 mm. 



Specimen No. 819, plate XIII, figure 3, is disarticulated and 

 very fragmentary. The epihyal (eh) is complete. This speci- 

 men is the same size as specimen No. 808, plate XIII, figure 1. 



Specimen No. 810, plate XIII, figure 4, represents a pair of 

 palatines, a pterygoid, and a quadrate. Only one of the pala- 

 tine fangs is present, exposing the outer surface, which is 

 quite smooth. 



Measurements : ^^^ 



Distance from the caudal edge of the quadrate to the cephalic end of 



the pterygoid 80 



Longest tooth on the pterygoid 12 



Length of the palatine fang 16 



Specimen No. 832, plate XV, figure 12, represents a pair of 

 complete palatines, a premaxillary, and a fragmentary left den- 

 tary. These remains are from a much smaller individual than 

 those just considered. The fangs are grooved on the caudal 

 surface. The specimen is unique in having the dental fang as 

 long as the palatine fang. The dental fang is distinctly 

 grooved mesio-caudally, and the other large teeth of the den- 

 tary are minutely striated mesially. The small teeth on the 



