CLA SSIFICA TION OF VER TEBRA TA 1 9 



ing limbs. Both jaws with numerous alveolar teeth. With 

 " abdominal " ribs. Humerus without entepicondylar foramen. 

 Pubes and ischia distally not united. Pubes simple. 



At least with two rows of dorsal dermal bones. 



Tail long, with numerous movable chevrons. 



In the recent forms : cloacal opening longitudinal ; penis 

 anterior, single. 



1. Order Pseudosuchia, Zittel. Premaxillae separated by 

 the large nasals. 



Nares la tero- terminal. Without lateral temporal foramen. 

 Aetosaurus. Upper Keuper, Wuerttemberg. 

 Ornithosuchus. L. Trias, Elgin. 



2. Order Parasuchia, Huxley. Premaxillae long and 

 united. 



Nares far back, near the orbits. Choanae near the anterior 

 end of the separated palatina. With upper and lateral tem- 

 poral foramen. 



Belodon. Keuper of Europe, India. 



3. Order Eusuchia, Huxley. Premaxillae short. Nares 

 terminal. Choanae behind the palatine symphysis. 



Amphicoelous until the lower Chalk, then procoelous. 



Teleosaurus. Jurassic, since Lias ; marine, Europe. 



Steneosaurus. Jurassic, since Lias ; marine, Europe. 



Metriorhynchus. Jurassic, since Lias ; marine, Europe. 



Pholidosaurus. Wealden and lower Chalk ; Europe. 



Gavialosuchus. Miocene, marine, Europe. 



Tomistoma. Miocene, marine, Mediterranean. 



T. schlegeli. Recent, fresh-water, Borneo. 



Gavialis. Pliocene, fluviatile, Sivaliks. 



G. gangeticus. Eecent, India, Burmah. 



Alligator. Since the upper Chalk, fluviatile, of Europe. 

 Eecent, SE. United States, and China. 



Caiman. East Andean South America. 



Osteolaemus. West African estuaries. 



Crocodilus. Since the upper Chalk of Europe ; Tertiary 



of Europe and North America. 



Recent: Africa, India, Austro- Malaya, tropical America 

 (South America, Central America, and Antilles). 



Total number of recent Crocodilian species about twenty. 



