AND AVES OF NORTH AMERICA. 79 



round cup -with thick edges. In the cervicals the hypapophyses are represented by rudimental elevations separated 

 by a space, except on the third, where there is the usual anterior cross ridge, followed by a concavity. I refer here a 

 dorsal, kindly lent me by Prof. Marsh, where the cup is more transverse oval than in T. obscurus. 



The lumbars from Barnesboro are characterized by a form more slender than those of the T. tenebrosus, more 

 nearly resembling some from the series of T. obscurus. Measurements of : 



In. 



Fifth cervical : length to shoulder, 21 . 



" posterior angle parapophy sis, 15. 

 " anterior " " 6. 



width to posterior angle parapophyses, 19.25 



" behind the parapophyses, 13.25 



" of cup above, 15. 



" vertical diameter cup, 15.25 

 " neural canal, 8. 



Lumbar : length to shoulder, 24. 



vertical diameter cup, 18. 



width of " " 17. 

 " neural canal, 5. 



" basis of neural arch in front, 15. 



Specimens of an adult from the pits of the West Jersey Marl Co., near Barnesboro, Gloucester County. 



THORACOSAURUS, Leidy. 

 Cretaceous Reptiles, Smithson. Contrib., XIV., 5. Pr. Ac. N. Sci., Phila., 1852, 35. 



This genus adds to the characters of Holops, a pair of large prefrontal foramina 

 similar to those characteristic of Teleosaurus, and Plesiosaurus. The other cranial char- 

 acters, as well as the vertebral, are very different from those of Teleosaurus, which is 

 amphicoelian, and are rather those of the existing Gavialis. The teeth and cervical 

 vertebra?, however, differ from those of the latter genus. 



"What is not seen in Gavialis or Holops is the character here presented, of a strong 

 septum dividing the posterior nares most completely; the latter open inferiorly and oppo- 

 site the hinder part of the crotaphite foramina. 



A species, the T. macrorhynchus, occurs in the cretaceous of France, as observed by 

 Leidy. 



THORACOSAURUS NEOCAESARIENSIS, JDekay. 



Leidy. Smithsonian Contributions, XIV., 1865, 5. Tab. I. 



Gavial Dekay Ann. Lye. N. York, 1833, 156. Tab. III., fig. 7-10. Gavialis neocaesaricnsis'De'kay. Zool. New 

 York, 1842, pt. III., 1844, 82. Crocodilus s. Gavialis clavirostis Morton. Proceed. Acad. Nat. Sci., Phila.. 1^44. 82. 

 Giebel Fauna v. Vorvelt, 1847, 122. Crocodilus basifissus Owen. Journ. Geol. Soc, London, 1849, 381, Tab. X., 

 f. 1, 2. Palaeontology, 1860, 277. Pictet Traite de Palaeontolgie I., 1853, 482. Crocodilus dekayi Leidy. Journ. 

 Acad. Nat. Sci., II., 135. Sphenosaurus Agassiz. Proceed. Ac. N. Sci., Phila., 1S49, 160. Thoraeosaurus grandis 

 Leidy. Proc. A. N. Sci., Phila., 1852, 35. 



Cretaceous limestone of Vincentown, Blackwoodtown, and Big Timber Creek ; sandstone of Navesink ; green- 

 sand of Blackwoodtown, Barnesboro, and Monmouth County, New Jersey. 



