0. C. Marsh — Classification of the Dinosauria. 85 
“ Family JLabrosauride. Anterior vertebre strongly 
opisthoccelian, and cavernous. Metatarsals much elongated. 
Pubes slender, with anterior margins united. 
Genus Labrosaurus. 
Sub-Order Ca@LuRIA (Hollow tail.) 
(5.) Family Ceeluride. Bones of skeleton pneumatic or 
hollow. Anterior cervical vertebrae opisthoccelian, remainder 
bi-concave. Metatarsals very long and slender. 
Genus Celurus. 
Sub-Order CoMPSOGNATHA. 
(6.) Family Compsognathide. Anterior vertebre opistho- 
ceelian. Three functional digits in manus and pes. Ischia 
with long symphysis on median line. Only known specimen 
European. 
Genus Compsognathus. 
DINOSAURIA ? 
(5.) Order Hatnopopa (Leaping foot.) Carnivorous ? 
Family Hallopodide. 
Genus Hallopus. 
The five orders defined above, which I had previously 
established for the reception of the American Jurassic Dino- 
saurs, appear to be all natural: groups, well marked in general 
from each other. ‘The European Dinosaurs from deposits of 
be 
ave in Morosaurus a branch leading toward the Stegosauria. 
The latter order, likewise, although its type genus is in many 
