169 
-ordinate, and co-exten- 
2 
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as synonyms. 































Scapula and coracoid of 
after Marsh 
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STRUCTURE AND RELATIONSHIPS OF OPISTHOC(ELIAN DINOSAURS. 
The three terms, then, are essentially co 
‘‘Opisthoceelia’’ has priority, and is entitled to preference. 
term will therefore be used in this paper to designate the order; 
-Sive. 
‘“Cetiosauria’’ and ‘‘Sauropoda’’ being regarded 
Ze AA LEA 






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A patosaurus, after Marsh. 
The genus Afatosaurus Marsh was proposed in 1877 upon a con- 
siderable portion of a skeleton, but with brief description only.* Early 
in 1879 the genus was characterized by the structure of the scapula, 
* Am. Jour. Sc., 3d Ser., Vol. xiv, p. 514. 
