290 THE OSTEOLOGY OF THE REPTILES 



Pleistocene. Tomistoma, Hungary, 

 Recent. Tomistoma, Borneo. 



Tertiary. Leptorhamphus Ameghino, Oxydontosaurus Ameghino, 

 Argentina. 



Family Crocodilidae.^ Vertebrae procoelous. Posterior nares 

 surrounded by pterygoids, single or divided. Upper temporal open- 

 ings small. Postorbital bar subdermal. Face never slender. Teeth 

 stout, anisodont. Dorsal plates in two or more rows, the ventral 

 armor present or absent. The nasals usually reach the external nares. 

 From four or five to more than forty feet in length. 



Uppermost Cretaceous. Deinosuchus Holland, Bottosaurus Leidy 

 [Agassiz], Brachychampsa Gilmore, Leidy osuchus Lambe, ? Polydectes 

 Cope, North America. Crocodilus Laurenti, Italy. 



Eocene. Crocodilus Laurenti, Diplocynodon Pomel, Europe, North 

 America. Limnosaurus Marsh, North America. 



Oligocene. Caimanoidea Mehl, South Dakota. 



Miocene. ''Crocodilus'' [?], [Alligator], North America. 



Pleistocene. Crocodilus Laurenti, Europe, India, Africa, North 

 America. [Alligator, North America.] 



[Recent. Crocodilus, Osteolaemus, Osteoblepharon, Alligator, Cai- 

 man, Jacare.] 



Incertae Sedis. Lower Jurassic. Notochampsa Broom, South 

 Africa. 



B. Suborder thalattosuchia 



Marine crocodiles, without bony armor, and with Umbs more or 

 less modified as paddles, without claws. Vertebrae platycoelous. 

 Face more or less elongated. Nares at posterior end of palatines. 

 Prefrontals large, protuberant. Supratemporal openings large. 

 Bones of skull smooth. Orbits with sclerotic plates. No antorbital 

 or mandibular openings. Seven cervical, twenty-five presacral, 

 vertebrae. Tail long, with distal fin-like dilatation. 



1 [Williston here includes the genera Alligator and Caiman under the Crocodilidae, 

 and places Tomistoma in a separate family, but Mook {op. cil.) has shown that Alli- 

 gator, Caiman, and Jacare are more distinct from Crocodilus and its allies {Osteolae- 

 mus, Osteoblepharon) than is Tomistoma. — Ed.] 



