. Bulletin - United States National Museum. Science. Comparative measurements of radii, Ceratosaurus and Antrodemus. Ceratasaurm nasicornis, No. 4735, Antrodemus miens. No. 4734, Greatest length of radius Greatest transverse diameter of proximal end (treatest transverse diameter of distal end 150 48 36 222 56 40 Forefoot.—As mentioned above a complete fore foot of Ceratosaurus is as yet unknown, though the articulated left manus gives a fairly good idea of its structure. The phalangial formula, however, remains to be definitely determined. With the tj'pe the following bones o
. Bulletin - United States National Museum. Science. Comparative measurements of radii, Ceratosaurus and Antrodemus. Ceratasaurm nasicornis, No. 4735, Antrodemus miens. No. 4734, Greatest length of radius Greatest transverse diameter of proximal end (treatest transverse diameter of distal end 150 48 36 222 56 40 Forefoot.—As mentioned above a complete fore foot of Ceratosaurus is as yet unknown, though the articulated left manus gives a fairly good idea of its structure. The phalangial formula, however, remains to be definitely determined. With the tj'pe the following bones of the fore feet are preserved: Meta- carpals I, II, III, IV, and proximal phalanges of digits 2, 3, and 4 of the left nianus; meta- carpals IV, distal halves of metacarpals I and II, and proximal phalanx of digit 2 of the right foot. Carpus.—Ossified carpal bones are unknown in Ceratosaurus, and although the articidated foot mentioned above was foimd in position in relation to the distal ends of the radius and ulna (fig. 60), no carpal ossifications were found in the intervening matrix. This would appear to indicate an unossified carpus, for this specimen is an old individual, as clearly demonstrated by the coossified pelvic and metatarsal bones. Metacarpus.—The metacarpus consists of four bones, as shown by the foot found in Fig. KADius, ULNA AND FOEE FOOT OF Cera- pjace 33 dcplctcd in figure 60. The two me- TOSAURUS NASICORNIS MaKSH. NO. 4735, , 1 j_ 1 "L j. 1 TypE-j NAT. SIZE, ij, BADins; 17, Ulna, I, II, m, diau metacarp;ds are moderately robust ele- and IV, METACARPALS ONE TO FOUR. SHOWN AS jneuts, but I and IV are much reduced. FOUND I.\ THE , SEVERAL OF THE BONES NOT -- it- 1 il -il Tljl ENTiEELT UNCOVERED. MctacarpaJ 1 IS a short bone with slight!}^ expanded proximal and distal ends. The dis- tal end is deeply grooved and turns inward away from the central axis of the foot as in most other Theropod dinosaurs. This diversion is due to
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