green: ENCHODUS in KANSAS MUSEUM. 91 



swollen portion of the palatine lies in the concavity on the 

 mesial surface of the premaxillary. There is a bone shown in 

 the left view (fig. 4, c) which may be a portion of the cera- 

 tohyal. It is narrow at the ventral end and gradually widens 

 dorsally. About one-third the length from the ventral end it 

 divides into two parts. While passing under the ventral mar- 

 gin of the articular it splits into eight narrow strips. These 

 are somewhat broken. Their dorsal ends extend under the 

 caudal end of the dorsal ramus of the left dentary. Fifteen 

 branchiostegal rays are present. The species is larger and 

 the bones are relatively much stouter than in Enchodus 

 doliclius, and it is unlike E. doUchus in having no fringe of 

 minute teeth on the external alveolar border of the dentary. 

 The following measurements were taken : 



mm. 



Length of mandible 185 



Length of maxillary 110 



Length of pveopeicular 105 



Length of premaxillary 75 



Lengtli of dentary fang 12 



Length of palatine fang (estimated) 17 



Greatest diameter of palatine fang at middle 6 



Greatest diameter of dentary fang at middle 4.5 



Depth of caudal end of mandible 45 



Enchodus ainicrotlus Stewart. 



The type of this species is a single dentary, described and 

 figured in the University Geological Survey of Kansas, vol. VI, 

 pp. 378-379. The characters given are as follows: absence 

 of the row of minute teeth on the alveolar border of the den- 

 tary; the dentary is shallow, and supports nine large teeth, 

 the cephalic one being slightly recurved at the apex ; and the 

 "base does not seem to be expanded" as in some of the other 

 forms ; external surface of the fang not striated. This species 

 was represented by the type specimen only, which, unfortu- 

 nately, has been lost. However, numerous other specimens 

 have been found since which appear to be the same species, 

 and from these it is to be hoped that the species may be put 

 upon a firm basis. It seems best to make a cotype of the most 

 complete of these specimens. This one is shown in plate X, 

 figure 3. It is No. 379. 



Such diflferences as are found between the skull of this 

 ■^-ecies and that of Enchodus doliclius, in so far as the sped- 



