1 6 KANSAS UNIVERSITY QUARTERLY. 



here are elongate and narrow, with interdigitated sutural ends. On 

 the lower side of the one exposed they are flat, with the inner mar- 

 gin thin, but somewhat thickened on the outer part. 



Length of lateral marginal 130 mm. 



Width at one end 35 



Width at other end 27 



Width of contiguous marginal 37 



Thickness near middle 6 



The half of two contiguous marginals lying over the left scapula 

 show the outer part thicker, from nine to eleven mm. in thickness, 

 the inner part very thin, and, near the middle, below the thin border 

 a shallow horizontal pit, which may have been for the reception of a 

 rib. The greatest width of these bones is 39 mm. 



r ^^"^^ ^^ 



Lateral marginal iind uliut^nt ])1 l-^ll il bone ol Dfinaloi lifhih loiiu two-thirds 

 natural size. 



Plastron. 



All the plastron was originally preserved, but part has been lost, 

 and some has been necessarily injured or destroyed in getting at the 

 bones lying between it and the carapace in the hard matrix. Lying 

 contiguous with the upper end of the right humerus is a large, thin, 

 flat bone which is evidently the epiplastron. The bone had sustained 

 injuries or decomposition before fossilization, or was of a partly 

 cartilaginous nature. Its thicker, rounded border is gently concave 

 and measures a little over 200 mm. in length. Lying upon it and 

 impressed as though partly pressed into its substance, is evidently 



