162 O. C. Marsh—Metatarsal Bones of Oe Ceratosaurus. 
The position of the foramen, as seen in figure 1, A is 
especially characteristic of recent birds, and, as a whole, t 
hind foot of this fe urassie Dinosaur was evidently similar to 
that of a typical bi 
horas ae, ips (eae 
TO 
Figure 2.—United metatarsal bones aa great gonad (Aptenodytes Pennantit, 
G. R. Gr.); left foot, front view. Natural s 
All known adult birds, living and extinct, with possibly the 
re a ne aoe of Archwopteryx, have the tarsal bones firmly 
nite ile all the Dinosauria, except Ceratosaurus, have 
ties fistiea atoll te. The exce tion in each case brings the 
two classes near together at this t, and their close ee 
has now been clearly demonstrated. 
Yale College, New Haven, July 23d, 1884. 
