Dhiosaurla — Sauropoda. 



9 



formidable spines (as AcanthophoUs, Polacanthns, IJijlceosaurus, 

 &c.), others were without such defences. Most of these 

 animals had flat or biconcave centra to their vertebra?, the 

 anterior (cervical) vertebra? had hollow cups behind. Two 

 pairs of limbs were always present, furnished with strong-clawed 

 digits. 



They were probably to some extent amphibious in their 

 habits, bat their limbs were well fitted for progression on the land. 



The group has been provisionally sub-divided into the 

 following sub-orders, namely: — 



and TaTsle- 

 cases, Nos. 

 7 to 10. 



Diuosauria. 



SuB-ORD£R 1. — Sauropoda (Lizard-footed). 



The members of this group of Dinosaurs were all herbi- 

 vorous, and included some of the largest forms hitherto dis- 

 covered, by far the hugest being the American genus Atlan- 

 tosatio'us, from the Jurassic of Colorado. Although no entire 

 skeleton has been found, it is supposed to have attained a 



Atlantosau- 

 rus. 



Wall-case, 

 No. 3. 



Fig. 12. — Lateral view of skuU of Di pi m loci'. s loiirms (JiUwsh), from the " AtUintosaurus" beds 



(Upper Jurassic), near Canon City, Colorado, N. America (J nat. size). 



(Not yet represented in the Collection.) 



length of over 80 ft., and a height of 30 ft. A plaster-cast of a 

 thigh-bone (femur) shown in this case is 6 ft. 3 in. long. 



Another remarkable genus, from the same horizon and 

 locality, is the Diplodocjis, an animal intermediate in size between 

 Atlantosaurus and Mornsanrus, which may perhaps have attained 

 to 40 or 50 feet in length, when living. The teeth indicate that it 



