OSTEOLOGY OF CARNIVOROUS DINOSAURS. 149 



EXPLANATION OF PLATES. 



Plate 1. 



Type of Antrodemus. valens Leidy, compared. Anterior half of an anterior caudal centrum. 

 No. 218, U.S.N.M. 

 Figs. 1, 2, and 3. Posterior, lateral and sectional views of the type of Antrodemus valens Leidy. 



4, 5, and 6. Same views of No. 8367, U.S.N.M. Sixth caudal vertebra of Antrodemus valens 

 Leidy, previously identified as Allosaurus fragilis Marsh to show the close resemblances of these 

 bones in two different individuals. All figures slightly more than two-thirds nat. size. 



(See p. 3.) 

 Plate 2. 



Type of Allosaurus fragilis Marsh. 



Fig. 1. Proximal phalanx of digit III, right-hind foot. No. 1930, Yale University Museum, superior 

 view. 



2. Posterior dorsal centrum, same specimen. Inferior view. 



3. Posterior sacral? centrum, same specimen. Inferior view. Reproduced from photographs of 



casts of the type specimen. All figures about three-quarters nat. size. (See p. 4.) 



Plate 3. 



Skull of Antrodemus Leidy. 



Fig. 1. Top view of the skull of Antrodemus valens Leidy. No. 4734, U.S.N.M. (See p. 14.) 



2. Skull and lower jaws Antrodemns valens Leidy. Viewed fromthe right side. No. 4734, U.S.N.M. 

 Both figures about one-quarter nat. size. Reproduced from photographs. The light-colored 

 portions represent the restored bones. (See p. 7.) 



Plate 4. 

 Skull of Antrodemus. 



Fig. 1. Top view of the skull of Antrodemus valens Leidy. No. 4734, U.S.N.M. (See p. 14.) 



2. Skull of Antrodemus valens Leidy. Viewed from the right side. No. 4734, U.S.N.M., 

 alsp., alisphenoid; an., angular; ar., articular; d., dentary; ec.pt., ectopterygoid ; 

 ex.mf., external mandibular foramen;/., frontal; /'., first antiorbital fenestra;//', second 

 antiorbital fenestra; j., jugal; la., lachrymal; lat.t. fen., lateral temporal fenestra; 

 mx., maxillary; n., nasal; o., orbit; p., parietal; par., prearticular; pf, prefrontal; pmx., 

 premaxillary; p.oc, paraoccipital; po.f, postfrontal; pt., pterygoid; q., quadrate; qj., 

 quadratojugaL; sa., surangular, sq., squamosal; s.t.f, supratemporal fossa. Both figures, 

 one-quarter nat. size. (See p. 7.) 



Plate 5. 

 Scapulae of Antrodemus. 



Fig. 1. Left scapula and coracoid of Antrodemus valens Leidy. No. 4734, U.S.N.M. The blade of 

 this scapula has suffered injury in life, as evidenced by the bifurcated and greatly widened 

 end, as compared with the opposite normal bone of the same individual, see fig. 2. (See p. 57.) 

 2. Right scapula and coracoid of same. Both figures about one-third nat. size. (See p. 58.) 



Plate 6. 

 Humerus of Antrodemus. 



Figs. 1-7. Left humerus of Antrodemus valens Leidy. Yale University Museum, a, anterior side; 

 d., deltoid ridge; i. c, internal condyle; o. c, outer condyle; p., posterior side. Fig. 1, 

 internal view; 2, posterior view; 3, anterior view; 4, external view; 5, proximal view; 

 6, distal view; 7 crosssection of shaft. All of the figures are one-half natural size. 

 Drawn under the direction of Prof. 0. C. Marshy (See p. 58.) 



144035°— 20 11 



