PLATE XXVII. 



Jurassic Dinosaurs. — Sauropoda. 



DlPLODOCID.E. 



Page. 



Fig. 1. Atlas of Diplodocus longus Marsh; side view ; one-half natural size 180 



Fig. 2. The same; front view; one-half natural size 180 



a, articular face for axis; c, cup; n, neural canal; o, cavity for odontoid 

 process of axis ; r, face for rih ; :', posterior zygapophysis. 

 Fig. 3. Cervical vertebra of Diplodocus longus; front view; one-eighth natural 



size 180 



Fig. 4. Dorsal vertebra of Diplodocus longus; back view; one-eighth natural 



size 180 



a, metapophysis; b, ball; c, cup; d, diapophysis; /', lateral foramen; n, 

 neural canal; r, rib; z, anterior zygapophysis; z', posterior zyga- 

 pophysis. 

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