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290 Pleistocene. Tomistoma, Hungary.

Recent. Tomistoma, Borneo.

Tertiary. Leptorhamphus Ameghino, Oxydontosaurus Ameghino, Argentina.

. Vertebrae procoelous. Posterior nares surrounded by pterygoids, single or divided. Upper temporal openings 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, Leidyosuchus 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, Caiman, Jacare.]

. Lower Jurassic. Notochampsa Broom, South Africa.

Marine crocodiles, without bony armor, and with limbs 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.