436 The American Naturalist. May, 
The Harpagosauria are represented by Megalosaurus, Hylæo- 
saurus, Telorosaurus. 
Cope’s first note on the classification of the Dinosaurs was 
published in the Proc. Acad. Nat. Sci., Phila., 1866, p. 317. He 
distinguishes Orthopoda with the genera Scelidosaurus Ow, — 
Hylzosaurus Mont., Iguanodon Mont, Hadrosaurus Leidy ; 
and Goniopoda with the genera Lælaps Cope and Megalosaurus 
Buckl. : 
In 1870 Cope (9) characterized these in the following way: 
ORTHOPODA. 
“Cope, Proc. Ac. Nat. Sci., Phila., 1866, 317. Therosauria 
Haeckel, 1866. Proximal tarsal bones distinct from each other 
and from the tibia, articulating with a tibia and with a terminal 
face of a well-developed fibula. The ilium with a massive, nar- 
rowed, anterior prolongation. Hadrosauride, Iguanodontide, 
Scelidosauride.” 
- GONIOPODA COPE. 
“Proc. Ac. Nat Sci, Phila., 1866, 317. Harpagosauria Haeckel, 
1866. Proximal tarsal bones distinct from tibia ; the latter closely 
embraced by the much-enlarged astragalus, on its inferior and 
anterior faces, forming an immovable articulation. Astragalus 
with an extensive anterior articular condyle below, above in con- 
tact with the fibula, which is much reduced, especially distally : 
Anterior part of the ilium dilated and plate-like. Lælaps, Poe- 
cilopleuron, Megalosaurus, Cœlosaurus, and perhaps Bathygnathus 
and Aublysodon.” ; 
In the same paper a third group, SYMPHYPODA, İS established, l 
with the genera Compsognathus and Ornithotarsus and the follow- 
ing- characters : 2 
“ First series of tarsal bones confluent with each other and with 
the tibia. Fibula distally much reduced. Anterior piit MARE 
dilated, plate-like.” ` aS 
Later it was found that Ornithotarsus belonged to the - ~ 
poda, Compsognathus to the Gonipoda. 
Huxley (10) gave the first characteristic of the 
1869. “The bony exoskeleton is sometimes more 
Dinosauria = 
