CEOCODILUS SP.— T0MI8T0MA GAVIALOIDES. 267 



Another fragment shows that not only the ninth and tenth, but also the eleventh 

 tooth was enlarged. 



R. 3344. Anterior portion of left ramus of mandible. The total length of the specimen is 17 cm., 

 the length of the symphysis about 6"5 cm. 



R. 3197. Fragment of right ramus of mandible with the remains of three teeth. 



Genus TOMISTOMA, S. Miiller. 



[Arch. f. Nat. (1846) p. 122.] 



Tomistoma gavialoides, Andrews. 



[Plate XXIII. figs. 3, 3 a.] 

 1905. Tomistoma gavialoides, C. W. Andrews, Geol. Mag. [5] aoI. ii. p. 483. 



Type Specimen^ — A nearly complete skull, wanting only the posterior portion of the 

 palate and the end of the rostrum (PI. XXIII. figs. 3, 3 a) ; Geological Museum, 

 Cairo. 



• This species is in many respects intermediate between Gharialis and Tomistoma. 

 The roof of the skull is wide, the supratemporal openings large. The nasals extend 

 forwards between the facial processes of the premaxillae ; the premaxillary expansion 

 is less than in Gharialis. There are 22-23 teeth on each side. The length of the 

 type skull from occipital condyle to tip of snout is 64 cm. 



Form. & Log. — Fluvio-m<irine beds (Upper Eocene) : north of Birket-el-Qurun. 



Remains of this species are fairly abundant, though for the most part fragifientary. 

 The best specimen found by Mr. Beadnell is the nearly complete skull, which is figured 

 and is to be regarded as the type. In its general form, as well as in many of the details 

 of its structure, this skull is intermediate between those of Tomistoma schleqeli and 

 Gharialis gangeticus *, resembling the latter in so many points that, were it not 

 for the facts that the nasals are in contact with the premaxillae and that the number 

 of teeth is small, this species might almost as well be referred to Gharialis as to 

 Tomistoma. 



The upper part of the occipital surface is almost exactly as in Gharialis, a small 

 wedge-shaped process of the supraoccipital appearing on the skull-roof, interposed 

 between the posterior ends of the parietals and forming a backwardly projectino- 



* Eor a comparison of the skulls iu these two species, see Koken, " Thoracoscmms macrorTii/nchus, Bl. 

 aus der TufEkreide von Maastricht," Zeitschr. deutsch. geol. Gesell. vol. 40 (1888) -p. 754. 



2m2 



