In the first two groups the pubis projects downward and forward as it does in the majority of reptiles, and the ilium is a high rounded plate; while in the others the pelvis is of a wholly different type, strongly suggesting the pelvis of birds.
[Illustration: Fig.

9 .-- Pelves of Dinosaurs illustrating the two chief types (Saurischia, Ornithischia) and their variations.] Recent researches upon Triassic dinosaurs, especially by the distinguished German savants, Friedrich von Huene, Otto Jaekel and the late Eberhard Fraas, and the discovery of more complete specimens of these animals, also clear up the true relationships of these primitive dinosaurs which have mostly been referred hitherto to the Theropoda or Megalosaurians.

The following classification is somewhat more conservative than 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.