AND AVES OF NORTH AMERICA. 



79 



round oup with thick edges. In tho corvicals 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: 



Fifth cervical : length to shoulder, 



" posterior angle parapophysis, 

 " anterior " " 

 width to posterior angle parapophyses, 

 " behind the parapophyses, 

 " of cup above, 

 " vertical diameter oup, 

 " neural canal, 

 Lumbar : length to shoulder, 



vertical diameter cup, 

 width of 



. " . neural canal, 

 " basis of neural arch in front, 



In. 

 21. 

 15. 



C. 

 19.25 

 13.25 

 15. 



15.25 



8. 

 24. 

 18. 

 17. 



5. 

 15. 



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



THORA COSAURUS, Leidy. 

 Cretaceous Reptiles, Smithson. Uontrib., XIV., 5. Pr. Ac. N. Sci., Phila, 1852, S5. 



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 tin; 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. 



Til OK. ATOM AIM! UK ffEOCAESARIENSIS, Dekay. 



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



Gavial Dekay Ann. Lye. N. York, 1833, 150. Tab. III., fig. 7-10. Gavialis ncocaesariensis T>ekay. Zool. New 

 York, 1842, pt. III., 1844, 82. Oroeodilus s. Gavialis claviroslis Morton. Proceed. Acad. Nat. Sci., Phila., 1844, 82. 

 Giobel Fauna v. Vorvelt, 1847, 122. Orncodilus basifllSUS Owen. Journ. Oeol. Soc, London, 1840, 381, Tab. X., 

 f. 1, 2. Palaeontology, 1880, 277. Plctet Traite de Palaeontolgie I., 1858, 482. Croeodilus dekayi Leidy. Journ. 

 Acad. Nat. Sci., II., 135. Sphenowurui A.gassiz. Proceed. Ac. N. Sci., Phila., 1840, 100. Tlwracomurus grandis 

 Leidy. Proe. A. N. Sci., Phila., 1 852, 35. 



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

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



