14 KANSAS UNIVERSITY QUARTERLY. 



flattened, high and broad, with distinct rugosities on the outer side. 

 The head is a small oval articular surface surmounting a rather thin 

 small plate placed nearly at right angle to the plane of the trochanter 

 and at one side. Just back or below (?) the head is a distinct 

 depression or "digital" fossa, with a muscular rugosity near it. 

 On the outer, or dorsal convex surface, near the narrowest part of 

 the shaft, there are two roughened surfaces, one on the border 

 opposite to that of the head forming a rounded tubercle about half 

 an inch in diameter. The lower part of the bone is expanded and 

 quite thin. 



Width of trochanter 32 mm. 



Height of trochanter above the head 25 



Height of head above plane of trochanter 20 



Length of articular surface of head 10 



Width . 7 



Width of shaft 25 



Thickness of shaft 12 



Width near lower extremity as figured 40 



Thickness 6 



Carapace. 



The carapace must have been originally nearly complete, but 

 much has been lost and other portions have been injured in removing 

 the hard matrix. It was evidently narrow in proportion to its length, 

 and was pointed posteriorly. The bone everywhere is very thin, 

 from two to three millimeters in thickness and shows numerous small 

 or minute pits; no other evidence of shields, however, is present. 

 The sutures in some places between the pleuralia and neuralia are 

 distinct, but for the greater part obliterated. The lateral plate cor- 

 responding to the third presacral vertebra has a length of 135 mm., 

 but the very thin end is wanting, and may have been prolonged to 

 the marginal. Its width proximally is 40, toward the outer part five 

 or six millimeters more. The neural for this vertebra has its front 

 and lateral sutures distinct; at its broadest part behind it measures 

 32 mm. in width. 



The dorsal vertebrae are stout and cylindrical, with moderate 

 expansions at the extremities. The rib processes are stout, situated 

 near the anterior part of each vertebra and the ribs articulated with 

 one centrum alone in the posterior vertebra at least. The pro- 

 cesses and heads of the ribs are stout, and are united by a free suture. 

 The ribs of the three presacral vertebrae exposed are directed very 

 obliquely upward; the transverse processes of the .sacrum are nearly 

 horizontal, slender, and the first pair directed a little obliquely 

 backward. 



