286 University Geological Survey of Kansas. 



probably eight or nine in number, of which all were very feeble 

 excepting the first. 



There are five vetebral columns of this genus preserved, two 

 of which are practically complete, and the other three only par- 

 tially so. There are also portions of several more columns, but, 

 as they have not been numbered in the positions they occupied 

 in life, I will not use them in the table given below. The most 

 complete column has 77 centra present, which I think is all 

 the animal had in life, with the exception of one of the terminal 

 caudals. The other contains 73. Unfortunately, the neural 

 and haemal arches are gone, or so badly preserved that their 

 characters cannot be made out in most instances. The first 

 anterior vertebra is much shorter than those following, and the 

 anterior end is not so deeply concave. It presents deep pits 

 above for the neur apophyses, but none below for the pleura- 

 pophyses, the points where they should be being marked by scars. 

 This one and the two or three following are usually without 

 lateral grooves, but the second and third sometimes show them. 

 The pits for the neurapophyses are large in these, as in the first, 

 and the pits for the pleurapophyses become functional at about 

 the third or fourth. 



Back of the vertebrae just mentioned, the pits for the neura- 

 pophyses begin to assume the elongated form found farther back 

 in the column, and the number of lateral grooves on the sides 

 become somewhat varied. 



To illustrate this last point, I have arranged the following 

 table to show the individual variation in the different speci- 

 mens. In this table the numbers at the heads of the columns 

 represent the catalogue numbers of the various specimens, 

 while those on the left are the numbers of the various vertebrae 

 from the skull. A blank is left in some places where the ver- 

 tebra is badly injured. The grooves are represented by 1-1 

 when there are two well developed, 1-0 when only one is pres- 

 ent. When there is one well developed and another slightly 

 so, they are expressed by 1-1 — or 1-0+ , 1-1 — expressing a 

 slightly greater development than 1-0+ . 



