8 THORACOSAURUS. 
of De Blainville’ and Gervais,” that of the extinct Gavial of New Jersey was more 
than one-third larger. ‘These two Cretaceous Crocodilians present characters in 
common, so peculiar in comparison with other known forms, recent and extinct, 
that they may be considered as belonging to a distinct genus, for which the name of 
Thoracosaurus has already been proposed for one of the species, and may equally 
apply to the other. 
Measurements of the Skull of THORACOSAURUS NEOCESARIENSIS. 
Estimated length of skull : : : : from 42 inches to 
Breadth at condyles of tympanics or articulation of the lower jaw 
Breadth of face at the last teeth . 
Breadth of face at the fourteenth teeth, gear iee Ser petal 
Height of cranium at the occiput : 
Breadth of cranium at the posterior border of ie anit aap the 
parietal and mastoids 
Distance from summit of the occiput to palma eorcemter of the frontal 
Length of alveolar border from back end of maxilla to the fourteenth 
alveolus, or broken end of the fossil 
Length of palatines in the median suture 
Breadth of palatines together at the middle 
Length of palatine foramina 
Breadth of palatine foramina 
Distance from occipital condyle to br Bien end of the canal, pane ante 
ing with the fourteenth tooth, counting from behind 
Breadth of muzzle at anterior extremity of the palatine foramina 
Breadth of cranium at middle of the temporal foramina - 
Transverse and antero-posterior diameters of the temporal foramina 
Transverse and antero-posterior diameters of the orbits 
Distance apart of orbits where nearest 3 : ° é = . 
Distance apart of temporal fossee : c 4 - - 5 
Length of frontal : . 5 F : 5 - 
Breadth of frontal between post- Seeatin 
Length of parietal 
Breadth of parietal posteriorly 
Distance between anterior ends of malars 
Breadth of nasals between anterior ends of pre- Entel 
Breadth of nasals between anterior ends of lachrymals 
Diameter of posterior nares 
Thickness of border of septum pemrcet ie latter 
A small fragment of the lower jaw of an extinct Gavial from the ferruginous 
sandstone, of the Cretaceous era, of the Highlands of Navesink, New Jersey, was 
described by Dr. J. E. De Kay, in 1833, in the third volume of the Annals of the 
Lyceum of Natural History of New York, page 158. The fragment, now more 
mutilated than formerly, I have had the opportunity of inspecting, through the 
kindness of Prof. E. Emmons, of Albany. The specimen is about six inches in 
% 
1 Osteographie; Reptiles, Plate 6, Crocodilus macrorhynchus. 
2 Zoologie et Paléontologie Francaises, Plate 59, fig. 18. 
Inches. 
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