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THE AMERICAN NATURALIST [Vol. XL 



has strongly developed transverse processes (Figs. 6, 7, 8, T.), 

 to which are attached short, thick ribs {R.). These ribs, like the 

 processes to which they are attached, are flattened in an antero- 

 posterior direction, so that, at their points of attachment, they are 

 considerably thicker in a dorso-ventral direction than they are in 

 an antero-posterior direction. The ribs, with the exception of 

 those attached to the sacrum (to be presently described), stand 

 out at right angles from the vertebrte, and taper to a sharp, round 

 point. In the anterior part of the body the ribs are somewhat 

 longer than the processes to which they are attached, while in the 

 region near the sacrum they are shorter. The transverse proc- 

 esses are of about the same length on all of the body vertebra, 

 and project rather strongly towards the posterior. The base of 



each transverse piorc-, [m iimahd \^\ ;i small vcrtcliral canal 

 most prominent on the first. 



