430 MEMOIRS OF THE CARNEGIE MUSEUM. 



most likely has likewise disappeared, or rather united with the ectoloph, while 

 the cingulum may be lighter or even wanting. The cingulum has united (by the 

 wear of the tooth) with the internal border of the grinding face, especially on the 

 posterior portion. It is very evident, from the enclosed post-fossette that the 

 dentition illustrated by Loomis is very much more worn than that of the type of 

 D. niobrarense. Finally through the courtesy of Professor Loomis. I had the 

 opportunity of restudying his type and find that the Amherst specimen as well 

 as the description agree quite well with the average old female skulls of D. cooki 

 in the Carnegie Museum. 



Measurements of the Type of D. niobrarense. 



Greatest length of skull, approximately 450 mm. 



Length of skull from occipital condyle to and including P^ 370 " 



Length of skull from occipital condyle to M' 190 " 



Greatest transverse diameter of skull 235 " 



Greatest transverse diameter of brain-case 130 " 



Greatest transverse diameter of frontals 150 " 



Greatest transverse diameter of occipital condyles 103 " 



Greatest transverse diameter of palate 68 " 



Vertical diameter of the orbit 60 " 



Length of 2d, 3d and 4th premolars and the molar series 185 " 



Antero-posterior diameter of P^ 26 " 



Transverse diameter of P- 29 " 



Antero-posterior diameter of P* 32 " 



Transverse diameter of P'' 36 " 



Antero-posterior diameter of M' 39 " 



Transverse diameter of M' 37 " 



Antero-posterior diameter of M' 35 " 



Transverse diameter of M' 39 '' 



Scapula, approximate height 280 " 



Humerus, length 340 " 



Tibia, length (No. 1910) 335 " 



Tibia, length (No. IQlOo) 310 " 



Tarsus, height tuber of calcaneum not included, approximately 85 " 



Tarsus, length of tuberosity of calcaneum 58 " 



Metatarsal II, length 130 " 



Metatarsal III, length 145 " 



The occurrence of the material of the above described species in the Agate 

 Spring Fossil Quarries is of considerable interest. Diceratherium niobrarense 

 has only been found in Quarry A. The remains of this species may be said to be 

 practically absent in the representative fauna of the quarries in the Carnegie or 

 the University Hills (See Mem. Car. Mus. Vol. IV, Fig. 1, p. 205), while similar 



