TOMISTOMA GAYIALOIDES. 269 



in detail by Toula and Kail * under the name Gavialosuchus eggenhurgensis, and placed 

 by Lydekker f in the genus Tomistoma. This species also is intermediate in many 

 respects between OhariaUs and Tomistoma. Some of the more important points in 

 which its skull differs from that here described are ; (1) the roof of the skull is 

 relatively narrower ; (2) the borders of the orbits are raised ; (3) the temporal fossae are 

 smaller. On the other hand, the resemblances are so considerable that if the genus 

 Gavialosuchus were maintained the present species might be referred to it. 



Koken % has described, under the name Thoracosaurus macrorhyncJius, the skull of a 

 long-snouted Crocodile from the uppermost Cretaceous beds of Mount Aime, near 

 Epernay, a form originally figured by de Blainville § as Crocodilus macroi^hynchus. He 

 shows that it is intermediate in form between the skulls of Gharialis and Tomistoma, 

 and it seems to resemble closely the species now under discussion. It is doubtful, 

 however, whether Blainville's Crocodilus macrorhyncJius can properly be referred to 

 Thoracosaurus, a genus originally founded by Leidy || for the reception of the species 

 T. neocesariensis, de Kay, sp.% from the Upper Cretaceous of New Jersey, the skull of 

 which differs in possessing antorbital vacuities (which, however, according to Koken, 

 may be merely accidental breaks in the bone), a more massive skull, and relatively larger 

 teeth. In any case it appears that the present species, Gavialosuchus eggenhurgensis, 

 and Thoracosaurus macrorhynchus are all intermediate between Gharialis and 'Tomi- 

 stoma, as now existing, and for the present the contact of the nasals with the premaxillse 

 seems to incline the balance in favour of placing them in Tomistoma. 



C. 8948. Skull, wanting the posterior part o£ the palate and the tip of the snout. The type 

 specimen described above and figured on PI. XXIIl. figs. 3, 3 a. All the teeth are 



wanting. The dimensions (in centimetres) o£ this specimen are : — 



Length from quadrate articulation to snout .... .68 app. 



„ occipital condyle to snout 64 



„ anterior border of orbit to end of snout . . 46-5 app. 



Width between outer angles of quadrates 27 



„ of forameu magnum 2'5 



Grreatest width of skull-roof 18 



,, „ superior temporal fossa 6'9 



Antero-posterior diameter of orbit 4-8 



Width of interorbital bar . . 3'4 



„ middle of rostrum 6'4 



Extreme length of premaxillfe 19-5 



K. 3329. Plaster cast of the above specimen. Made in the British Museum. 



* Toula and Kail, " Ueber einen Krokodil-Schadel aus den Tertiarablageruagen von Eggenburg," 

 Denkschr. d. k. Akad. Wiss. math.-naturw. CI. vol. 1. (1885) p. 299, pis. i.-iii. 



t Lydekker, " On the Occurrence of the Crocodilian Genus Tomistoma in the Miocene of the Maltese 

 Islands," Quart. Journ. Geol. Soc. vol. xlh. (1886) p. 20. 



+ Op. cit. supra. § Osteographie, Atlas, vol. viii. pi. vi. 



II Proc. Acad. Nat. Sci. Philad. vol. vi. (1852) p. 35. IT Zool. Nesv York, pt. iii. (1842) p. 28. 



