270 TEETIAET VEETEBEATA OF THE EAYtM. 



E. 3325. Posterior portion of skull. The dimensions (in centimetres) of this specimen are : — 



"Width between enter angles of quadrates 28*5 



„ of foramen magnum 3 



„ of skull-roof 18 



,, of supratemporal fossa 6"1 



„ of iuterorbital bar 3-9 



Presented by the Egyptian Government, 1904. 

 R. £108. Portion of hinder part of skull of a rather larger individual. 



Presented hy W. E. de Winton, Esq., 1903. 

 R. 3109. Portion of rostrum. Presented hy W. E. de Winton, Esq., 1903. 



The following specimens from the Fluvio-marine beds may also belong to this species : — 

 R. 3342. Anterior dorsal vertebra. 



R. 3343. Scute. Differs from the scutes from the Qasr-el-Sagha series referred to T. africanum in 

 having a sKght median cai-ina. 



R. 3341. Proximal half of a left scapula, closely similar to that of T. schlegeli. 



R. 3107. Portion of right ischium. Presented hy W. E. de Winton, Esq., 1903. 



Tomistoma africanum, Andrews. 



[Plate XXIII. figs. 1, 2 ; text-fig. 86.J 

 1901. Tomistoma africanum, C. W. Andrews, Geol. Mag. [4] vol. viii. p. 443. 



Type Specimen. — A nearly complete mandible, from which the teeth are missing 

 (PI. XXIII. fig. 1) ; Geological Museum, Cairo. 



The mandible upon which this species is founded is that of a very long- and 

 slender-snouted Crocodile, the total length of the specimen being just over a metre 

 (106 cm.). The symphysial region is long and narrow, and extends back to the 

 fourteenth alveolus; the splenial enters into its formation, extending forwards to 

 about the tenth alveolus. 



Form. & Loc. — Qasr-el-Sagha beds (Middle Eocene) : north of Birket-el-Qurun. 



Anteriorly the jaw is very slender, but behind the last alveolus it deepens con- 

 siderably and the lateral opening (PI. XXIII. figs. 1 a, 1 b) is as large as in the recent 

 Tomistoma, and considerably larger than in Gharialis. The sutures between the bones 

 enclosing the opening are not to be made out. The ridge forming the shelf-like border 

 of the inner side of the angular bone seems to be continued up to the posterior angle of 

 the lateral opening. The articular bone [art.) is produced upwards and backwards into 

 a very long and narrow process, considerably longer than in the recent species of Tomi- 

 stoma or in the Gavial. The articular surface for the quadrate is simply concave from 

 before backwards, and not divided by a ridge into a smaller inner and a larger outer 



