ENCHODUS. 



63 



the premaxilla, but the teeth both of the palato-pterygoid arcade and of the 

 dentary are well displayed. 



As shown by this specimen, the tubercles on the outer side of the frontal region 

 are disposed along the usual radiating ridges. A fragment of the parasphenoid 

 ( pas.) indicates that the basicranial axis was parallel with the hinder part of the 

 cranial roof. Traces of the antorbital cheek-plate (ao.) show the tuberculated 

 radiating ridges already observed in E. lewesiensis. The hyomandibular (Tim.) is a 

 rather wide lamina of bone, its upper articular border extending from end to end 

 of the otic region. The quadrate is notched to receive the symplectic, as especially 

 well seen in B. M. no. 49811. The palato-pterygoid arcade is very characteristic 

 of the species, and a restored outline- sketch of it is given in Text-fig. 14. The 

 ectopterygoid and its dentition are for the most part exposed in figs. 9, 10 (ecpt), 

 but are still better seen in B. M. no. P. 5416, which is used as the basis of Text-fig. 

 14. There are six large, slender ectopterygoid teeth, of which the foremost, 



Fig. 14. Enchodus pulchellus, A. S. Woodward ; left palato-pterygoid arcade, outer aspect.- 

 English Chalk, ecpt., ectopterygoid ; i'L, palatine. 



inserted beneath the palatine articulation, is the largest, while the others decrease 

 in size backwards. The size and relative position of these teeth vary as in the 

 other species; but all are much laterally compressed, very delicately striated, mid 

 scarcely if at all recurved. On the inner face of the ectopterygoid, just above the 

 three hindermost teeth, there are three or four longitudinal rows of very small 

 tubercular teeth. As represented in Text-fig. 14 the palatine bone (pi.) forms 

 somewhat less than a quarter of the oral border of the palato-pterygoid arcade; but 

 half of this element extends backwards above the ectopterygoid, and its inner 

 facette for articulation with the ethmoid seems to have been restricted to this 

 hinder half. The terminal palatine tooth (figs. 9,10, pi.) seems to have closely 

 resembled that of E. lewesiensis, though apparently shorter when compared with 

 the length of its supporting bone. The isolated large palatine shown of the natural 

 size in figs. 11, \\a, is provisionally associated with this species, since its shape 

 appears to be identical with that of B.M. no. P. 5416. It is interesting as showing 

 on the inner face (fig. 11a) the rather complicated articular facette for union 

 with the ethmoid region. Its anterior portion is much produced in front of this 



