OOLITIC DINOSAURS. 169 



preserved : but this counterpart shows only the impressions of the teeth, which 

 are well preserved in the block containing the chief part of the fossil. Of these 

 teeth four are premaxillary, the rest maxillary. 



The teeth closely repeat the characters of those of previously described dental 

 evidences of Megalosaurus JBucJdandl. 



Of the foremost preserved premaxillary tooth, 2 inches of the crown remain, 

 with half an inch of a mutilated base : the next tooth is represented by a smaller 

 protruded apical part of the crown. The socket of the larger intervening tooth is 

 broken away with the implanted tooth-root, exposing the pulp-cavity. The 

 impression of the broken and missing part of the smaller premaxillary tooth gives 

 two inches of length to this tooth, the implanted remainder of both teeth has gone 

 with the supporting bone. In advance of the larger premaxillary tooth is an 

 elliptical cross-fractured basal part of a third (the anterior) tooth showing a long 

 diameter of nearly half an inch. 



Ten teeth are preserved in the maxillary bone. Between the foremost, third 

 and fifth, are crowns of successional or undeveloped teeth. Of the foremost of 

 these (second in the series) the apex only of the crown has appeared above its 

 socket, the rest of the tooth is exposed by removal of the socket's outer wall : a 

 length of enamelled crown of 2 inches 5 lines is thus shown. The length of the 

 protruded crown of the first maxillary tooth is 1 inch 9 lines, that of the third 

 tooth is 2 inches 3 lines, its total length is 5 inches. Of the fourth tooth the 

 apical half-inch of the crown is protruded : the total length exposed in the 

 quarrying is 3^ inches. The similarly shown length of the fifth tooth is 4 

 inches 9 lines, that of the enamelled ci'own being 3 inches. The sixth tooth shows 

 2 inches of free enamelled crown, and 2^ inches of the rooted cement-clad part, 

 the latter exposed by loss of the bone. The seventh maxillary tooth is represented 

 by a smaller proportion of the protruded crown. The eighth tooth is a functional 

 fully developed one, but of smaller size than the third and fifth. The apical half 

 of a somewhat smaller crown of a ninth tooth has emerged, and behind this is the 

 indication of a fully developed tenth tooth, not larger than the eighth. I cannot 

 predicate with confidence of an eleventh maxillary tooth. The crown of such 

 exposed tooth on the transversely fractured surface of the block may have come 

 from the lower jaw. 



Of the maxillary teeth the four or five hinder ones are suborbital, the three 

 front ones are subnarial ; the three intermediate teeth, including those with longest 

 and largest crowns, received the support, in biting actions, of the base of the facial 

 process («). 



At the fore part of the orbital cavity are two thin osseous plates, («?, e) convex 

 outwardly, of subtriangular form, with the apex naturally cut off so as to contribute 

 half the circumference of a pi'otruding circular space, half an inch across, exposing 

 22 



