• GREEN: ENCHODUS IN KANSAS MUSEUM. 85 



of fine teeth on the dorsal edge of this plate of bone in this 

 species. The base of the dentary fang is very much swollen. 

 Both dentaries display a peculiar mark on the mesial side of 

 the cephalic end, about midway between the fang and the 

 tooth ne.xt to it caudally. This is shown in the mesial view of 

 the symphysial portion of the right dentary of this specimen, 

 plate II, figure 2. This has the appearance of a repaired in- 

 jury, but the fact that no signs of it occur on the external 

 surfaces of these bones precludes this possibility. A similar 

 though not so definite a mark occurs on the dentary of 

 Enchodus petrosus Cope, specimen No. 836. The tubercles on 

 the symphysial portion of the dentaries are very much like 

 those on other species. On the externo-caudal side of the base 

 of the fang a small tooth has grown up ; also, on the external 

 alveolar border, cephalad to the fang, there were three small 

 teeth situated on an elevated base. The middle one has been 

 broken out, the other two only being shown in the figure (fig. 

 9, pi. III). The teeth of the dentary and pterygoid are all 

 grooved mesially. The fragmentary premaxillary of this 

 species is irregularly tuberculated (pi. Ill, fig. 6). The ven- 

 tral border is thickened, forming a heavy bar. The cephalic 

 end is also thickened, and sends dorso-caudally, at somewhat 

 different angles, two bars, which strengthen the thin dorsal 

 wing. These bars are best observed from the mesial side. 

 The symphysial portion of the left dentary (pi. Ill, fig. 7) 

 shows the deep mesial groove below the swollen base of the 

 dentary fang. The following measurements of this specimen 

 (pi. Ill, figs. 2, 6, 7, and 9) may be of service: 



Length of palatine fang 44 



Length of the dentary fang 35 



Length of mandible ' • • • ; ^^^ 



Greatest depth of mandible 50 



Length of large tooth on pterygoid 25 



Greatest diameter of this tooth at middle 6 



From symphysis to nearest point of the articular on the external 



surface 125 



The fine specimen. No. 807, figured in plate V, shows many 

 characters of this species heretofore not known. Most of 

 the cranial elements are represented, though they are frag- 

 mentary. The caudal portion of the skull shows the configura- 

 tion characteristic of this region. The small occipital crest is 



3-Univ. Sci. Bull.. Vol. VII. No. 2. 



