78 Bulletin American Museum of Natural History. [Vol. XIX, 



Fig. sg. Enchodus 

 petrosus Cope. No. 

 2062. X 3. Left pal- 

 atine fang from in 

 front. The line, bb^ 

 marks position of sec- 

 tion b. 



Fig. 60. Enchodus 

 s<evus Hay. No. 198. 

 X \. _ Type. Right 

 palatine fang from in 

 front. The line aa 

 marks position of the 

 cross-section a. 



of soon getting near the middle of the hinder surface of the 

 tooth, as it does in E. petrosus, it forms the outer border of the 

 tooth when this is looked at directly from 

 behind or front. These two edges divide 

 the surface of the distal end of the tooth 

 into two nearly equal faces, of which one, 

 somewhat smaller, is nearly anterior, but is 

 directed somewhat outward, while the larger 

 and somewhat more convex one is directed 

 backward and inward. About the middle 

 of the length of the tooth, where the section 

 (Fig. 60, a) is taken, the inner face is far 

 larger and more convex. The palatine bone, 

 from which Fig. 60 is taken, was only slightly 

 larger than that from which Fig. 59 was ob- 

 tained. 



The palatine bone has about the size of 

 that of E. ferox, figured in this paper, and 

 the fang has probably had about the same length. If we 

 measure the greatest diameter of this fang of E. ferox at a 

 point 10 mm. below its base we find it to be 10 mm., and 

 this diameter is the antero-posterior, while 

 the transverse diameter is not quite 8 mm. 

 At the same height the diameter of E. scbvus 

 is ID mm. in the transverse axis of the cross- 

 section, and 9 mm. in the antero-posterior. 

 The same proportions and directions of the 

 axes are found in E. petrosus as in E. ferox. 



The posterior end of the palatine (Fig. 61) 

 appears to differ somewhat from that of E. 

 petrosus (Fig. 62). It presents the same fSs^^x j. "ryp^. pZ- 

 smooth articular surfaces as are observed in a"n°/ bone° *^ ' ''^ ' 

 the latter species, but, as will be observed in 

 the figures, the lower process, a, of the bone in E. scevus, is 

 much thinner and higher than in E. petrosus. This difference 

 may not be specific but due in some part to accidents of fos- 

 silization. Fig. 61 represents the bone of the right side; Fig. 

 62, that of the left side. 



62 



Fig. 61. Enchodus 

 scevus Hay. No. ig8. 

 X 3. Type. Posterior 

 end of right palatine 

 bone, rt, articular pro- 

 cess. 



Fig. 62. Enchodus 



