MESOZOIC TIME — TRIASSIC AND JUKASSIC. 



763 



1209-1211. 



1211. 



The general character of the limbs, their height and massiveness, and the 

 form of the pelvic bones, are exhibited in Figs. 1209-1211 of Morosaurus 

 grandis Marsh, a species 

 about 40 feet long. The 

 femur (/) is about four 

 feet in length. The 

 teeth (Fig. 1211, half the 

 natural size) are shorter 

 than in the preceding 

 species, and more numer- 

 ous. ISTearly complete 

 skeletons of this Moro- 

 saurus have been ob- 

 tained by Marsh in 

 Wyoming. 



Fig. 1212 represents 

 a restoration of an 

 allied species, the 

 Bro ntosaurics excelsus 

 Marsh, of which also a 

 skeleton nearly complete 

 has been obtained. The 

 total length is about 60 

 feet, and the height of 

 the skeleton at the 

 middle of the body about 

 15 feet, showing great magnitude ; and yet it had, relatively to size of body, 

 one of the smallest of heads known among vertebrates. Like Morosaurus, 



DiNOSAUE. — Morosaurus grandis (x j'^). Fig. 1209, fore leg ; s, scapula ; 

 c, coracoid ; h, humerus ; r, radius ; u, ulna ; uc, ulnar carpal ; I, 

 first metacarpal ; Vmc, fifth metacarpal. Fig. 1210, hind leg ; il, 

 illiac ; is, ischium ; p, pubis ; /, femur ; t, tibia ; /', fibula ; a, 

 astragalus ; c, calcaneum ; Ymt, fifth metatarsal. Fig. 1211, tooth 

 (xj). From Marsh. 



1212. 



Fig. 1212, Brontosaurus excelsus, restoration (x j^jj). Marsh. 



its vertebree were very light and cavernous, with thin walls, even in the axis 

 of the sacrum. The feet were large enough to make tracks a square yard 

 in area. The sixth cervical vertebra was over 25 inches high and 21 broad. 

 The size of neck was still greater in another species, Apatosaurus laticollis 



