250 Bulletin American Museum of Natural History. [Vol. XIII, 



in the Lower Pliocene T. goldfussi Kaup. In the superior molars 

 the protocone is very prominent and rounded, giving a circular 

 form in extreme wear. The lower and upper cutting teeth at- 

 tain an enormous size, hence the adjective megalodine is appro- 

 priate. The shortening of the skull lowers the middle portion 

 of the cranium and in the typical species causes the nasals to 

 project upwards at the tips ; thus the irresistible tendency of 

 every Rhinoceros to develop a horn finds expression in the later- 

 ally compressed rugosities of the tip of the nasals (Z*. aurelianen- 

 sis, T./ossiger), while an abortive horn may appear on the frontals 

 {T. aurelianensis). The strong resemblance of T.fossiger to this 

 series was noted by Mme. Pavlow. 



The generic name Teleoceras Hatcher is the first applied to a 

 member of this series and will be of service to distinguish its 

 members throughout. Valid specific differences are found be- 

 tween the Lower, Middle, and Upper Miocene and Lower Plio- 

 cene stages ; there are certainly three and possibly four species 

 in Europe. 



I. Lower Miocene Stage. 



Sables de VOrleanais. 



Teleoceras (R.) aurelianensis Nouel. — Type : A skull. 

 Loc. Neuville-aux-Bois, Loiret. 



Paris : Characters of type, (i) Three lower premolars in jaw 

 associated with skull ; also observed in an isolated better preserved 

 jaw, thus : pj=^ , mf ; flattened outer face of inferior molars is 



p.3 



Fig. II. Teleoceras atirelianensis. Type : Superior molars. X f. Paris. 



another characteristic ; superior premolars 3-4 shorter than the 

 molars and provided with antecrochet, as seen also in maxillary 

 series (Collection Vibraye). The strong simultaneous develop- 

 ment of antecrochet and crochet distinguishes the molars, as well 



