338 Prof. H. G. Seeley on Euskelesauvus Brownii. 



margin, and a more distinct and marked rounding of the side 

 towards the base, which appears to be slightly curved in 

 front, but forms a sharp ridge behind, which separates it 

 from the flat inner side of the bone. There is no indication 

 of a symphysial surface, unless it be in the slightly rugose 

 extremity of the inner surface of the dentary bone ; but that 

 surface could only be regarded as symphysial on the hypo- 

 thesis that the bone has there been distorted by pressure. 



The alveolar border, as preserved, is somewhat concave 

 from front to back. A groove which runs along the splenial 

 bone, from a quarter to half an inch below the alveolar 

 margin, is also concave in length, and a number of oblique 

 impressions, as of blood-vessels, descend from this margin 

 downward and backward over the splenial. It is thus evident 

 that, although the teeth are here contained in sockets, any less 

 development of the superior border of the splenial bone would 

 give them the appearance of a Lacertilian mode of implanta- 

 tion. In l^Jegalosaurus BucTclandi the outer alveolar margin 

 rises much higher than the inner margin, so that all stages of 

 intermediate development between the condition now described 

 and the Pleurodont or Acrodont attachment of the teeth may 

 be looked for in Saurischia. The contact between the teeth 

 and their sockets in this specimen is extremely close, and 

 there is some appearance of the bone of the superior alveolar 

 surface having grown up around the tooth so as to invest it. 

 Indications are apparently preserved of eleven teeth, without 

 any reason for inferring that the hindermost of the series is 

 present. The eighth tooth is preserved in natural attachment. 

 It is directed upward, outward, and a little backward ; its 

 root or unenamelled part rises fully an inch above the alveolar 

 border. On this base the root is transversely ovate in section, 

 f inch long, \ inch wide, but becoming somewhat narrower 

 posteriorly. This upper portion of the root has somewhat 

 the appearance of having been invested in a sheath of hard 

 thick skin. The crown in this specimen has only its basal 

 part preserved ; it is enamelled, rounded in front, and com- 

 pressed behind to a sharp ridge, which is marked with trans- 

 verse serrations quite on the pattern of Megalosaurus, but 

 much finer than those seen in the maxillary teeth of Euskele- 

 saurus Brownii. The enamel is remarkably smooth and the 

 extremities of the serrations appear to be rounded. Further 

 forward a portion of a loose root was found just indicating 

 the base of the crown, and in what I take to be the fourth 

 socket on the inner side is a successional tooth not quite 

 perfectly exposed, but showing the external surface of the 

 crown lor a depth of about f inch. It is about ^ inch wide. 



