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Rh Upper Jurassic. Atoposaurus Meyer, Alligatorellus Jourdan, Alligatorium Lortet, Germany.

. Vertebrae platycoelous. Internal nares bounded by pterygoids and palatines. Face rather broad, not long. Postorbital bar subdermal. A dorsal armor of two or more rows of plates.

Lowermost Cretaceous. Goniopholis Owen, Europe, North and South America. Nannosuchus Owen, Theriosuchus Owen, Machimosaurus Meyer, Bernissartia Dollo, Europe.

Upper Cretaceous. Coelosuchus Williston, Teleorhinus Osborn, Wyoming. Notosuchus Woodward, Cynodontosuchus Woodward, South America.

. Vertebrae platycoelous; internal nares between palatines and pterygoids. Face very slender. Postorbital bar subdermal. From fifteen to eighteen feet in length.

Lower Eocene. Dyrosaurus Pomel, Africa.

. Vertebrae probably procoelous. Internal nares surrounded by pterygoids. Palate with large foramen between ectopterygoid and maxillae. Skull short, broad.

Wealden Cretaceous. Hylcœochampsa Owen, ? Heterosuchus Seeley, England.

. Vertebrae procoelous. Posterior nares surrounded by pterygoids. Face very slender. Postorbital bar subdermal. Upper temporal openings large. Nasals remote from nares. Dorsal but no ventral scutes. From ten to fifty feet in length.

Pleistocene, Recent. Gavialis Oppel, Rhamphosuchus Owen, Paleosuchus Falconer and Cautley, India.

. Vertebrae procoelous. Posterior nares surrounded by pterygoids. Face less elongated, gradually merging into cranium. Postorbital bar subdermal. Nasals extend into nares. Sometimes an antorbital opening. From six to forty or more feet in length.

Upper Cretaceous. Thoracosaurus Leidy, Holops Cope, United States.

Eocene. [Tomistoma, Europe, Africa.] Eosuchus Dollo, Belgium.

Pliocene. Tomistoma (?) [Gavialosuchus], Florida.