46 Annals of the Carnegie Museum. 



Measurements. 



mm. 



Greatest length of the jaw fragment 86 



Depth of mandible at M r 24 



Depth of mandible at Pg -. 20 



Length of the dental series, including canine 68 



Length of premolar series 33 



Length of molars T and ¥ 22 



Antero-posterior diameter of carnassial tooth 15 



Transverse diameter of carnassial tooth at base 8 



Antero-posterior diameter of heel of carnassial tooth 4 



A Provisional List of the Fauna of the Agate Spring 

 Fossil Quarry. 

 Parahippus. 



Diceratherium niobrarense Peterson. 

 Dicer ather ium cooki Peterson. 

 Moropus elatus Marsh. 

 Dinohyus hollandi Peterson. 

 ? Merycochozrus. 

 Merychyus elegans Leidy. 

 Amphicyon super bus sp. no v. 

 Nothocyon annectens sp. no v. 



Diceratherium niobrarense Peterson. 



{Science, Vol. XXIV., No. 609, pp. 281-282, 1906.) 



(Plates XIII. and XIV.) 



(Type. No. 127 1 Carnegie Museum Catalogue of Vertebrate Fossils.) 

 In comparing this species with the type of Diceratherium nanum 

 Marsh, 15 and also with the complete and well preserved skull of that 

 species (No. 7324) in the American Museum of Natural History, 16 

 certain differences are observed. 



In the type of Diceratherium nanum, PL is relatively larger than that 

 tooth in Diceratherium niobrarense , the nasals are somewhat more pro- 

 duced in front of the nasal horn-cores, and are also apparently heavier 

 than in the latter species. In the specimen in the collection of the 



15 The front of a skull and lower jaws in Yale Museum, No. 526. 



16 This specimen was referred by Cope to the species Diceratherium nanum, and 

 is apparently identical with the type so far as comparison can be made. 



