TOM ISTOMA (MAMA LOI DES. 
201 ) 
in detail by Toula and Kail * under the name G avialosuchus eggeiihiircjensis, and placed 
by liydekkerf in the genns Tomistoma. This species also is intermediate in many 
respects between Gharialis 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 fossm are 
smaller. On the other hand, the resemblances arc so considerable that if the genus 
Gavialosnchus were maintained the present species might be referred to it. 
Koken J has described, under the name Tlioracosaiirus macrorliynchus, the skull of a 
long-snouted Crocodile from the uppermost Cretaceous beds of Mount Aimc, near 
I'ipernay, a form originally figured by de Blainville ^ as Crocod 'dus macroydiynchus. 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 macrorliynchus can properly be referred to 
Thoracosaurus, a genus originally founded by Leidy || for the recej^tion of the species 
T. neocesarie7isis, 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 eggeJiburgensis, 
and Thoracosaurus macrorliynchus are all intermediate between Gharialis and Tomi- 
stoma, as now existing, and for the present the contact of the nasals with the premaxillae 
seems to incline the balance in favour of placing them in Tomistoma. 
C. 8948. Skull, wanting the posterior part of the palate ami the tip of the snout. The type 
specimen described above and figured on PI. XXIIl. figs. 3, 3 a. All the teeth ai'c 
wanting. The dimensions (in centimetres) of this sjiecimen are : — 
Length from quadrate articulation to snout 68 a])p. 
,, occipital condyle to snout 64 
„ anterior border of orbit to end of snout . . 46'5 app. 
AVidth between outer angles of quadrates 27 
„ of foramen magnum 2‘5 
Greatest width of skull-roof 18 
,, „ superior temporal fossa 5-9 
Antero-posterior diameter of orbit 4-8 
AVidth of interorbital bar 3-4 
„ middle of rostrum 6'4 
Extreme length of premaxillas 19-5 
R. 3329. Plaster cast of the above specimen. 
]\[ade in the British Museum. 
*' Toula and Kail, “ Ueber eineu Krokodil-Schadel aus den Tertiarablageruugen von Eggenburg,” 
Denksebr. d. k. Akad. Wiss. math.-naturw. Cl. vol. 1. (1885) p. 299, pis. i.-iii. 
t Lydekker, “ Gn the Occurrence of the Crocodilian Genus Tomistoma in the Miocene of the Maltese 
Islands,” Quart. Journ. Geol. Soc. vol. xlii. (1886) p. 20. 
J Op. cit. supird. 
1[ Proc. Acad. Nat. Sci. Pbilad. vol. vi. (1852) p. 35. 
§ Osteographie, Atlas, vol. viii. pi. vi. 
^ Zool. New York, pt. iii. (1842) p. 28. 
