T. F. Olcoit—New Species of Teleoceras. 403 



Art. XXXYIIL — A New Species of Teleoceras from the 

 Miocene of Nebraska ; by Theodore F. Olcott. 



Teleoceras minor, sp. nov. 



This small rhinoceros from the Loup Fork beds of the 

 Niobrara River Valley, Cherry Co., Nebraska, was found by 

 me last year and represents the remains of a fully adult but 

 not old animal. The specimen was broken into several pieces 

 but is well preserved and consists of the occipital region and 

 roof of a skull, the right zygomatic arch and maxilla with the 

 grinders as far as premolar one in place. It shows a very 

 small but unmistakable rugose spot on the median line of the 

 frontals, as does Teleoceras medicomutus Osborn.* Its 

 affinities to the genus are recognized in the laterally compressed 

 nasals with rounded and protruding tips, the low and broad 

 occiput, the low sagittal crest and the constricted protocone 

 and strong crochet on the molars. The premolars are less 

 reduced than in T.fossiger. In this respect the type appears 

 to stand between Teleoceras and Aphelops with tendency 

 towards Teleoceras. The alveole of premolar one indicates a 

 small, short-rooted tooth. 



The species is small, the contour of the skull is concave 

 antro-posterially, the frontal region is flattened, the free nasals 

 are moderately long with tips protruding 15 mm beyond their 

 inferior borders, which are slightly expanded anteriorly. The 

 superior dental series is P 4 M 3. There is a well developed 

 crochet on all the teeth. 



The protocone and hypocone are united in the partly worn 

 premolars and enclose the median valley. The crochet is prom- 

 inent on the molars and the antecrochet is strong in molar 

 one. 



Measurements. mm 



Length from end of nasals to occipital crest ._ 430 



Height from lower border of occipital condyle to summit of 



occipital crest _. 180 



Transverse diameter of occiput including post-tympanic pro- 

 cesses 260 



Greatest transverse diameter of frontals 139 



Narial notch to orbit __ 68 



Length of free nasals 106 



Antro-posterior diameter of molars (crown measurements) . „ 129 



Antro-posterior diameter P 2 31 



*Bull. Am. Mus. Nat. Hist., vol. xx, pp. 319-321. 



