1900.] Osborn, Phylogeny of the Rhinoceroses of Europe. 259 



b. Higher Level, Simorre. 



R. simorrensis Lartet. — Paris: (i) In this animal from a 

 higher level (100 metres) we observe distinct specific progression : 

 the size is the same ; the lower canine is larger ; the first lower 

 premolar is single-fanged, reduced or wanting ; the crests of the 

 upper molars (Lartet Collection : No. 2380, catalogued as A. 

 tetradactylmn) are more distinct ; the younger molars have a 

 feebly indicated antecrochet and a very strong crochet ; upon 

 extreme wear the antecrochet comes out more strongly. (2) A 

 handsome lower jaw shows the vestigial pm^ persisting on the 

 left side, wanting on the right (Fig. 14); the lower grinders are 

 small, fine, and delicately built ; the diastema is rather short. 

 (3) A maxillary series (Coll. Lartet, No. 2380) is beautifully 

 preserved ; the fourth superior premolar is fully molariform, 

 with a prominent antecrochet ; the superior molars show a re- 

 duced antecrochet and a very prominent crochet. Measure- 

 ments : pm^ — m ^ = 193 (Coll. Lartet, No. 2380); pnig — nig 



= 195- 



Lyons : Two fine maxillae of R. simorrensis are found in the 

 Museum d'Histoire Naturelle and present characters exactly 

 similar to the above ; strong postfossettes are observed in pm^ — 

 m^ and strong and prominent crochets on pm^ — m^ ; the molars 

 have the internal cingula feeble or wanting. London : Upper 

 jaws and teeth (No. 33525, Villefranche, d'Astarac, Gers, France) 

 a beautifully preserved apparently />;;/«/<? skull with no trace of 

 median horns on frontals ; molar teeth with the same characters, 

 p^ — m^ = 193. A lower jaw (No. 33526, same locality) ex- 

 hibits a single-fanged and evidently much reduced first premolar. 

 The R. austriacum Peters is represented in Munich by the third 

 superior molar tooth. The type of this species from Eibiswald- 

 Leiding is doubtfully distinct from the foregoing. 



2, Upper Miocene Stage. 



Sieinheim, Grive-St.-Alban. 



The Upper Miocene stage of this small race is the so-called 

 R. steinheitnensis Jager, from Steinheim. (i) The finest example 

 of this stage is a maxilla in Stuttgart (Steinheim, No. 6032); 



