134 AMERICAN PERMIAN VERTEBRATES 



reaching a little beyond the hind end of the ilio-ischiadic suture. 

 The posterior iliac notch is deep and narrow, its upper border, 

 that is, the lower border of the posterior prolongation of the ilium, 

 is quite horizontal. As in Casea, the internal side of the upper 

 part of the ilium shows no indications whatever of sutural union 

 with the sacral ribs; it is evident that their attachment was liga- 

 mentous only and not very extensive. 



The right femur as preserved is in good condition, but its con- 

 dyles are a little worn. The digital fossa is elongated and rather 

 deep, the trochanteris ridge extending a little beyond the lower 

 end of the fossa. The summit of the trochanter is at the junction 

 of the upper and middle thirds of the bone; other characters will 

 be seen in the figures. 



MEASUREMENTS 



Length of cervical vertebra 12 mm. 



Transverse diameter of centrum of same 12 



Length of centrum opposite the hind end of interclavicle 13 



Transverse diameter of same 12 



Length of fifth presacral vertebra 16 



Length of fourth presacral vertebra 17 



Length of third presacral vertebra 17 



Length of second presacral vertebra 18 



Length of first presacral vertebra 19 



Transverse diameter of centrum of same 20 



Length of sacral vertebrae 60 



Expanse of first sacral ribs 80 



Extent of sacral ribs attachment 53 



Length of first and second caudal vertebrae 40 



It is evident that the relationships of this genus, so far as the 

 parts preserved indicate, are with Casea. Indeed, the characters 

 are so much alike that until the ilium was secured I was disposed 

 to place them both in the same genus. The backward prolonga- 

 tion of the ilium is, however, more than a specific character. The 

 species is considerably larger than Casea, but was in life probably 

 of similar proportions, attaining a length of perhaps four and a half 

 feet. Unfortunately nothing whatever is known of the skull. 



