the arrangement recently proposed by von Huene.

ORDER SAURISCHIA Seeley.
Suborder _Coelurosauria_ von Huene
(=Compsognatha Huxley, Symphypoda Cope.)
Fam. Podokesauridae Triassic, Connecticut.
" Hallopodidae Jurassic, Colorado.
" Coeluridae Jurassic and Comanchic, North America.
" Compsognathidae Jurassic, Europe.
Suborder _Pachypodosauria_ von Huene.
Fam. Anchisauridae Triassic, North America and Europe.
" Zanclodontidae }
" Plateosauridae } Triassic, Europe.*
Suborder _Theropoda_ Marsh (=Goniopoda Cope)
Fam. Megalosauridae Jurassic and Comanchic.
" Deinodontidae Cretacic.
" Ornithomimidae Cretacic, North America.
Suborder _Sauropoda_ Marsh
(=Opisthocoelia Owen, Cetiosauria Seeley.)
Fam. Cetiosauridae }
" Morosauridae } Jurassic and Comanchic.
" Diplodocidae }
Order ORNITHISCHIA Seeley
(=Orthopoda Cope, Predentata Marsh.)
Suborder _Ornithopoda_ Marsh (Iguanodontia Dollo)
Fam. Nanosauridae Jurassic, Colorado.
" Camptosauridae }
" Iguanodontidae } Jurassic and Comanchic.
" Trachodontidae (=Hadrosauridae), Cretacic.
Suborder _Stegosauria_ Marsh.
Fam. Scelidosauridae } Jurassic and Comanchic.
" Stegosauridae }
" Ankylosauridae (=Nodosauridae), Cretacic.
Suborder _Ceratopsia_ Marsh.
Fam. Ceratopsidae Cretacic.

* Regarded by Dr. von Huene as ancestral respectively to the
Theropoda and Sauropoda.

FOOTNOTES:

[Footnote 2: If some vast catastrophe should today blot out all the
mammalian races including man, and the birds, but leave the lizards
and other reptiles still surviving, with the lower animals and plants,
we might well expect the lizards in the course of geologic periods to
evolve into a great and varied land fauna like the Dinosaurs of the
Mesozoic Era.]

[Footnote 3: The ancestral types have four complete toes, but in the
true Theropoda the inner digit is reduced to a small incomplete
remnant, its claw reversed and projecting at the back of the foot, as
in birds.]

CHAPTER IV.

THE CARNIVOROUS DINOSAURS, ALLOSAURUS, TYRANNOSAURUS,
ORNITHOLESTES, ETC.

SUB-ORDER THEROPODA.

The sharp teeth, compressed and serrated like a palaeolithic spear
point, and the powerful sharp-pointe