GREEN: ENCHODUS IN KANSAS MUSEUM. 103 



external alveolar border of the dentary are i-elatively longer 

 and more slender than usual. 



Measurements : ^,n 



Leng-th of palatine fang 8 



Length of premaxillary 30 



Length of alveolar border of the dentary 52 



Length of dentary fang 8 



No. 827, plate XV, figure 11, is a fragmentary specimen, 

 consisting of a pair of palatines, pterygoid, subopercular, por- 

 tion of a preopercular, a premaxillary, a quadrate, and the 

 symphysial portions of the dentaries. This specimen has the 

 caudal end of the pterygoid complete and not attached to the 

 quadrate. It has on the dorsal surface, five and one-half milli- 

 meters from the caudal end, a very thin lamina extending 

 dorso-caudally. The premaxillary is also complete. It is 

 unique in possessing on the external side a row of very minute 

 processes, which appear to be denticles. The row begins three 

 and one-half millimeters from the cephalic end of the bone and 

 one millimeter from the alveolar border, and extends caudally 

 parallel to this edge. The row is three millimeters long. This 

 character has not been observed on any of the other specimens 

 of Enchodus. Whether it has any specific value can not now 

 be determined. Since the specimen is small, and possibly a 

 young individual, it is thought best not to attach much impor- 

 tance to the presence of these inconspicuous processes. The 

 specimen may prove to be distinct, but it has been considered 

 here because the other characters would indicate that it is 

 Enchndus dolichus. The dentaries have the characteristic ex- 

 ternal row of minute teeth and the ridges radiating from the 

 symphysis. The palatine fang is somewhat more slender and 

 straighter than the fang of the American Museum specimen 

 No. 1837, described by Doctor Hay in 1903. 



Measurements : , mm. 



Length of the palatine fang 10 



Length of the dentary fang ^ 



Length of the premaxillary 27 



Greatest depth of the premaxillary 6.5 



Specimen No. 156 is a single mandible, which is represented 

 in plate XV, figure 10. It differs from the mandible of speci- 

 men No. 174 in having a few more radiating ridges on the ex- 

 ternal surface of the dentary. Only four large teeth remain 



