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 loiown forms, recent and extinct, 

 tliat 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. 



Inches. Lines. 



Estimated length of skull .... from 42 inches to 45 



Breadth at condyles of tympanies or articulation of the lower jaw . 17 



Breadth of face at the last teeth 12 



Breadth of face at the fourteenth teeth, counting from behind . . 3 7 



Height of cranium at the occiput ....... 6 3 



Breadth of cranium at the posterior border of the orbits crossing the 



parietal and mastoids ......... 12 6 



Distance from summit of the occiput to anterior extremity of the frontal 11 

 Length of alveolar border from back end of maxilla to the fourteenth 



alveolus, or broken end of the fossil i? 



Length of palatines in the median suture 9 6 



Breadth of palatines together at the middle 2 9 



Length of palatine foramina ........ 8 



Breadth of palatine foramina ........ 3 6 



Distance from occipital condyle to broken end of the muzzle, correspond- 

 ing with the fourteenth tooth, counting from behind ... 29 

 Breadth of muzzle at anterior extremity of the palatine foramina . 8 

 Breadth of cranium at middle of the temporal foramina ... 8 

 Transverse and antero-posterior diameters of the temporal foramina . 4 3 

 Transverse and antero-posterior diameters of the orbits ... 3 3 

 Distance apart of orbits where nearest ...... 4 3 



Distance apart of temporal fossse 6^ 



Length of frontal 7 



Breadth of frontal between post-frontals 5 6 



Length of parietal .4 



Breadth of parietal posteriorly 4 5 



Distance between anterior ends of malars ...... 4 10 



Breadth of nasals between anterior ends of pre-frontals ... 3 1 



Breadth of nasals between anterior ends of lachrymals ... 1 9 



Diameter of posterior nares 1 8 



Thickness of border of septum between the latter .... 5 



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 



• Osteographie; Rcjjtiles, Plate 6, Crocodilus macrorhynchus. 

 " Zoologic et Paleonlologic Francaises, Plate 59, fig. 18. 



