PLATE III. 



Triassic Dinosaurs. — Theropoda. 



Anchisaurid.e. 



Page. 

 Fig. 1. Skull of Anchisaurus colurus Marsh; top view; one-half natural size.. 148 



Fig. 2. Base of same skull; back view; one-half natural size 148 



a, nasal opening; bp, has pterygoid process; d, upper temporal fossa; /, 

 frontal; j, jugal; n, nasal; o, orbit; oc, occipital condyle; p, parietal; 

 p', paroccipital process; pf, prefrontal; pm, premaxillary. 

 FIG. 3. Sacrum and ilia of Ammosaurus major Marsh; seen from below; one- 

 fourth natural size 150 



Fig. 4. Ischia of Anchisaurus polyzelus Hitchcock, sp. ; seen from above ; one- 

 half natural size 150 



a, posterior view of distal ends; ac, acetabular surface; il, face for ilium; 

 is, face for ischium; p, distal end; pb, face for pubis; s, symphysis; 1, S, 

 S, sacral vertebra'. 

 Fig. 5. Left fore foot of Anchisaurus polyzelus; back view; one-half natural 



size 149 



c, centrale; r. radiale; E, radius; U, ulna; /, first digit; V, fifth digit. 

 Fig. 6. Right hind foot of Ammosaurus major; front view; one-fourth natural 



size 150 



a, astragalus; c, calcaneum; F. fibula; T, tibia; t2, /.?, ti, tarsal bones; /, 

 first digit ; Y, fifth digit. 

 250 



