272 TERTIAET VERTEBEATA OF THE FATtM. 



A specimen (text-fig. 86), consisting of the anterior portion of the upper and lower 

 jaws in their natural position with regard to one an#bher, was also obtained from the 

 same horizon, and may be referred to this species with some confidence. There are 

 five premaxillary teeth, the second * being very small and situated close in front of the 

 third. The first, third, and fourth teeth are large ; the fifth is small, and behind it 

 there is a considerable diastema where the sides of the snout are hollowed out for the 

 reception of the large fourth mandibular tooth. The alveoli, with the bases of four 

 subequal maxillary teeth, are preserved. As in the mandible, the borders of the 

 alveoli are very prominent, and the teeth seem to have been directed somewhat 

 forwards. The premaxillary region is slightly expanded, and the nasal opening 

 is large and heart-shaped, with the point directed backwards. Unfortunately, none 

 of the sutures can be seen, so that the relations of the nasals and premaxillse cannot 

 be determined. The mandible, so far as preserved, agrees with that described above ; 

 the large size of the fourth tooth is well shown. 



With the. exception of the presence of a fifth premaxillary tooth, this specimen 

 agrees in all essentials with the corresponding parts of the skull and mandible of 

 Tomistoma schlegeli. 



C. 10006. Mandible. Type specimen described in Geol. Mag. [4] vol. viii. 1901, pp. 443-444. 

 Figured on PI. XXIII. figs. 1,1 A, 1b. The dimensions (in centimetres) of this 

 specimen are : — 



Total length 106 



Length of symphysis 49'5 



Width at narrowest part of symphysis 4-3 



„ posterior end of symphysis 11 



Depth of ramus at posterior end of symphysis 4*5 



Greatest depth of riiinus 12 



Width of articular surface for quadrate ... ... 4-2 



K. 3330. Plaster cast of the above specimen. Made in the British Alnseum. 



E. 3201. Anterior portion o£ rostrum and mandible in their natural position with regard to one 

 another. Figured in text-fig. 86. The dimensions (in centimetres) of this specimen 

 are : — 



Length of the portion of the rostrum preserved 31-o 



„ ,, mandible preserved 32"5 



Width of premaxillary region 7*5 app. 



„ rostrum at narrowest point ... . . 5 



Length of nasal opening 4-2 



Width of nasal opening 4-2 



Presented by the Egyptian Government, 1904. 



* In the description of this specimen given in Geol. Mag. [4j vol. viii. 1901, p. 444, the socket of this 

 small additional tooth was overlooked. 



