Dr. C. W. Andrews — Extinct Ecjyptian Vertebrates. 44IJ 



are short and broad, and have a very small extension on the palate 

 compared to that seen in Podocnemis, and they seem to have been 

 nearly excluded from the middle line by the backward prolongation 

 of the palatines. 



Four or five more or less complete skulls of this type were 

 collected, and it will be possible from them to give a detailed 

 account of the cranial characters. 



The symphysis of the mandible (Fig. 4b) is very long, and the 

 symphyseal region forms a broad pentagonal plate, the two anterior 

 sides of which form the labial borders, while the two lateral bear 

 the high pointed coronoid processes. The posterior side is slightly 

 concave. The dorsal surface of the symphyseal surface was probably 

 covered by a strong horny plate, which, judging from the large size 

 and anterior position of the coronoid process and the depth of the 

 muscle impressions, must have formed a powerful crushing apparatus. 

 The backward position of the internal nares seems to be correlated 

 with the existence of this arrangement, the union of the palatines 

 extending just far enough backwards to bring the opening behind 

 the level of the symphysis. Probably the anterior part of the palate 

 in front of the narial opening was also covered with a horny plate. 



To this new form I propose to apply the generic name Stereogemjs, 

 the species being called <S. Cromeri, after the Earl of Cromer, the 

 British Agent and Consul-General at Cairo. 



The dimensions of the figured skull and mandible are : — 



Skull. 



Extreme length as figured 96mm. 



Extreme width ' 98 ,, 



Width between ends of ectopterygoid wings 65 ,, 



Width between outer ends of articular surface of quadrates 7-1 ,, 



Width of articular siu'face of quadrate ... ... ... 14 ,, 



M.iNDIBLE. 



Total length 71mm. 



Length of symphysis ... ... ... ... ... 45 ,, 



Width at coronoid ... ... ... ... ... ... oo ,, 



Width at articulation for quadi-ate 64 ,, 



Several carapaces and plastra were collected which probably belong 

 to this form. Their Pleurodiran character is shown by the fusion of 

 the lower ends of the pubes and ischia with the plastron. As a rule 

 the mode of preservation is such that it is extremely difficult to 

 make out the position of the sutures, even in specimens otherwise 

 in excellent preservation. In one plastron, however, it seems fairly 

 clear that there were small lateral mesoplastrals and that a larg& 

 intergular plate was present. 



Crocodilia. 

 Tomistoma africanum, sp. nov. 



Eemains of Crocodilians are very common in the lower beds iu 

 some localities, and in some cases attain a very large size. Vertebrae 

 and scutes, either isolated or in groups, most commonly occur, 

 but occasionally a large part of the skeleton was seen. When 



1 This specimen is somewhat crushed, so that the width is slightly exaggerated. 



