58 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 91 



probably 4 and 5. The spines and the postzygapophj^ses are not pre- 

 served. The prezygapophyses, diapophyses, and parapophyses are 

 incompletely preserved. The centrum of the first vertebra of the pair 

 is incomplete. That of the second is complete and is moderately long, 

 rather low vertically and narrow posteriorly but broad anteriorly, ap- 

 parently convex posteriorly, but the degree of convexity cannot be 

 made out. The prezygapophyses and diapophyses of this vertebra 

 are incomplete, but enough of them is preserved to indicate that they 

 were very stout. There is a very small median hypapophysial keel 

 near the anterior end of the centrum. On the whole the vertebrae 

 appear small for the size of the mandible. The capitular and tuber- 

 cular ends of the left rib of the anterior of the two vertebrae are pre- 

 served ; they are very stout, especially the tubercular process. 



MEASUREMENTS (IN MILLIMETERS) 



Length of two large contact pieces of left ramus of mandible •192 



Maximum height of same 171 



Length of external mandibular foramen 265 



Height of same 56 



Length over four posterior alveoli, right ramus of mandible 82 



Height of maxillary and dentary fragments in place with each other 211 



Height of anterior mandibular tooth shov.ii in end of this fragment 94 



Breadth across atlas centrum, posterior end 88 



Length of atlas centrum 70 



Breadth across right atlas rib at proximal end 49 



Breadth across left atlas rib at proximal end 47 



Breadth across tuberculum end capitulum of right axis rib 43 



Breadth across tuberculum end capitulum of left axis rib '46 



Breadth across axis centrum posterior end 60 



Length of fifth (?) cervical centrum 83 



Breadth of fifth (?) cervical centrum anterior end 103 



Breadth of fifth (?) cervical centrum posterior end '70 



Breadth of fifth (?) cervical vertebra across prezygapophyses '97 



' Estimate. 



LITERATURE CITED 



GERVAIS, I'ATJL. 



1876. Crocodile gigantesque fossile au Bresil. Journ. Zool., vol. 5, pp. 

 233-236, 1 pi. 

 Mock, Charles Cbaig. 



1921. Brachygyiathosuchus iraziliensis, a new fossil crocodilian from Brazil. 



Bull. Amor. Mus. Nat. Hist., vol. 44, pp. 43-49, 4 figs. 

 1934. The evolution and classification of the Crocodilia. Journ. Geol., vol. 

 42, pp. 295-304, 1 fig. 

 NOPCSA, Fkanz Babon. 



1924. i'ber die Namen einiger brasilianischer fossiler Krolvodile. Ceniralbl. 

 Min., Geol. und Pal., 1924, p. 878. 

 P.\tte:rson, Bryan. 



1936. Caiman Jatirostri.s from the Pleistocene of Argentina, and a sum- 

 mary of South American Cenozoic Crocodilia. Herpetologica, vol. 

 1, pp. 43-54, 1 pi. 



RODRIGUES, JOAO BaRBOSA. 



1892. Les reptiles fossiles de lo vallee de I'Amazona. Vellosia. vol. 2 

 (1885-88), pp. 41-56, 16 pis. 



U ? GOVrPNMEtjr PRINTING OTFICE 19<I 



