Prof. H. G. Seelej on Euskelesaurus Brownii. 319 



the termination of the maxillary behind, and the extremity of 

 the ascending facial process above. The specimen has been 

 much decomposed by weathering, so that the palatal plate is 

 lost, as is almost all the internal bone defining the alveoli ; 



Fi?. 1. 



Jfarine. 



Maiillary. 



Premaxillary. 



Left maxilla of Eiishelesaurus Broicnii, showing successional teeth 

 iu three alveoli. -^V nat. size. 



so that they are mostly exposed as parallel oblong grooves, in 

 some of which the successional teeth are preserved. As pre- 

 served the jaw is 17i inches long and 8 inches deep below 

 tiie facial process. 



The inferior alveolar border is gently convex iu length, 

 especially beneath the facial process. Its margin appears to 

 be entire in front. The premaxillary suture is shown ascend- 

 ing in a straight line, at right angles to the alveolar margin 

 and oblique to the alveoli. It is within about 2^ inches of 

 the anterior extremity, as indicated by the impression, from 

 which the bone is broken away below the nasal vacuity. 

 There are no indications of teeth in the premaxillary bone 

 exposed, and if the teeth were of the same size as in the 

 maxillary, there could not have been more than two alveoli 

 within its limits. In the maxillary bone eleven sockets are 

 easily traced, and there appear to have been twelve. The 

 jaw is formed much on the type of Megalosaurus from the 

 Stonesfield slate, except that there is no indication of a simi- 

 larly extended posterior attenuation of the maxillary bone, 

 and the nasal vacuity has a lower lateral position at the side 

 of the snout, indicating relatively small depth anteriorly for 

 the tooth-sockets. The measurement below the narial margin 

 is 2f inches, so that the premaxillary teeth may have been 

 smaller than the maxillary teeth. The nasal vacuity is longi- 

 tudinally ovate, oi inches long and 1| inch deep in the ante- 

 rior half; its anterior border is well rounded, and a thin plate 

 of the premaxillary ascends to define its superior border. 

 There is no certain indication of the nasal bone on its upper 

 border ; but this may be due to conditions of preservation, for 

 the strength and breadth and direction of the facial maxillary 



22* 



