OSTEOLOGY OF CARNIVOROTTS DINOSAURS. 149 



EXPLANATION OF PLATES. 



Plate 1. 



Type of Antrodemus valcns 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 Antrodevius valcns Leidy. 



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

 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. L 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 Anlrodemus Leidy. 



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



2. SkuW and lower jaws Antrodemns valcns Leidy. Viewed from the 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 Atitrodemus. 



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; 

 wi.r., 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, s}., squamosal; s.t.f., supratemporal fossa. Both figures, 

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



Plate 5. / 



Scapulae of Anlrodemus. 



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., posterioi 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. O. C. Marsh. (See p. 58.) 



144035°— 20 11 



