150 BULLETIN 110, UNITED STATKS NATIONAL MUSEUM. 



Plate 7. 

 Fore and hind feet of Antrodemus. 



Fig. 1. Right hind foot of Antrodemus valens Leidy. No. 324, A.M.N.H. About one-sixth natural 

 size. Viewed from the front. (After Osborn.) 



2. Same foot. Oblique internal view to show the complete hallux. (After Osborn.) (See p. 73.) 



3. Right fore foot of Antrodemus valens Leidy, No. 4734, U.S.N.M. Less than one-half natural 



size. Shows the radius, ulna, and complete foot just as it was found in the sandstone. 



(Seep. 60.) 



PlATE 8. 



Sacrum of Antrodemus. 



Fig. 1. Sacrum of Antrodemus valens Leidy. No. 4734, U.S.N.M. Viewed from the left side; one- 

 fourth natural size, ac, acetabulum; d., diapophyses of sacral vertebrae; il., right ilium; 

 i. p., ischiac peduncle; p. p., pubic peduncle; sr., sacral ribs; s,s^, sacral vertebrae one and 

 five, respectively. The contour of the anterior border of the ilium is missing and is here 

 incorrectly restored; compare with fig. 2, pi. 10. Drawn under the direction of Prof. O. C. 

 Marsh. ■ ' (See p. 43.) 



Plate 9. 



Sacrum and ilia of Antrodemus. 



Figs. 1 and 2. Sacrum with attached ilia of Antrodemus valens I^eidy. No. 4734, U.S.N.M. ac, 

 acetabulum; il., ilium; i.p., ischiac peduncle; p.p., pubic peduncle; s., spinous proc- 

 esses; SiSj, sacral vertebrae one and live, respectively; z', posterior zygapophyses. 1. Pos- 

 terior v-iew of sacrum with articulated ilia. 2. Ventral view of same. Both figures one- 

 fourth natural size. Drawn under the direction of Prof. O. C. Marsh. (See p. 53.) 



Plate 10. 



Sacrum and ilia of Antrodemus. 



Figs. 1 and 2. Sacrum and ilia of Anlrodeums valens Leidy. No. 4734, LT.S.N.M. p. p., pubic pe- 

 duncle; s., spinous processes; S,, first sacral vertebra; z., anterior zygapophyses. 1. Ante- 

 rior view of sacrum with articulated ilia. 2. Lateral view of detached left ilium of same. 

 Both figures are about one-fourth natural size. Fig. 1. drawn under the direction of Prof. 

 O. C. Marsh. (Seep. 43.) 



Plate 11. 



> Pubes of Antrodemus. 



Figs. 1-3. Pubes of ^n(ro&TOi;.s raZens Marsh. In Yale University Museum. Young individual, d., 

 distal end of foot; il., surface for articulation with pubic peduncle of ilium; is., process for 

 articulation with pubis; su., sutural surface for union \vith opposite pubis on median 

 line. 1, anterior view of articulated pubes; 2, external view of right pubi.s; 3, internal view 

 of right pubis. All figures one-fourth natural size. Drawn under the direction of Prof. 

 O. C. Marsh. (See p. 67.) 



Plate 12. 



Ischia of Antrodemus. 



Figs. 1-8. Ischia of ^n(rocfcmi;s I'aZcns Leidy. In Yale University Museum. iL, surface for articula- 

 tion with ischiac peduncle of ilium; ob. pr., obturator process; p., process for articida- 

 tion with the pubis; s. s.. flattened sutural surface for union of the two ischia on the median 

 line. 1, posterior view of articulated ischia; 2. anterior \dew of articulated ischia; 3, external 

 view of left ischium; 4, internal view of left ischium; 5, top view of articulated ischia; 6, top 

 view of left ischium; 7, distal ends of articulated ischia; 8, cross section of shafts of ischia. All 

 of the figures one-fourth natural size. Drawn under the direction of Prof. O. C. Marsh. 



(See p. 68.) 



