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APPENDIX. 
Art. XXI.—On the United Metatarsal Bones of 
Ceratosaurus ; by Professor O. C. Marsu. 
In the April number of this Journal (vol. xxvii, p. 381), 
the writer described a remarkable new Dinosaur, the type of 
the genus Ceratosaurus, and of the family Ceratosauride. 
The skull, vertebrae, and pelvis were described and figured, — 
but at that time little was known about the feet. More 
recently portions of these have been recovered from the same 
individual, and they prove to be as remarkable as the other 
parts of the skeleton already made known. 
The most interesting feature in the extremities of this 
Dinosaur is seen in the metatarsal bones, which are completely 
ankylosed, as were the bones of the pelvis. There are onl 
three metatarsal elements in each foot, the first and fift 
having apparently disappeared entirely. The three metatarsals 
remaining, which are the second, third, and fourth, are 
ea y shorter and more robust than in the other 
c members of the order Theropoda, and, being firml 
eae to each other, they furnish the basis for a very strong 
oot 
In figure 1, these codssified metatarsals of Ceratosaurus are 
represented, and for comparison the corresponding bone of a 
penguin is given in figure 2. ; ; 
In es tte. these two figures, it will be seen that the three _ 
metatarsal elements of the Dinosaur are quite as closel 
united as those of the bird. To the anatomist familiar wit 
the tarso-metatarsal bones of existing birds, the specimen 
presented in figure 1 will sppest even more like this part in 
re 
the typical birds than the one shown in figure 2. 
10a 
