1900. J Osborn, Phylogeny of the Rhinoceroses of Europe. 237 



Cat. Foss. Mamm. Pt. Ill, p. 142) ; also No. M. 4507, superior deciduous pre- 

 molars 1-4, Loc. Phosphorites, Mouillac, France. In the Munich collection 

 from Cadibona are two small upper premolar teeth, pm 3-4, which answer this 

 description ; others from the Phosphorites, Quercy, are found in the Munich 

 collection (m^, m-, pm^, pm'). In Paris' from Quercy (Coll. Massenat) are 

 also small isolated premolar and molar teeth (p^-m*) of the same character, 

 found both in the Jardin des Plantes and the Ecole des Mines collections. 



Conclusions. — The small European Lower Oligocene species of 

 Rhinoceroses, although i?icertcB sedis, are partly Diceratheriinae, 

 partly Amynodontidae ; they should be referred to R. gaudryi or 

 R. velaunum or to new species. T\\^ large Lower Oligocene spe- 

 cies of the Phosphorites should be referred to the Aceratheriinae. 



2. Upper Oligocene. 

 ■5"/. Ge>'and-le-Puy, Moissac, Gantiat, Eselsberg {Ul?n), in part. 



Diceratherium minutum Cuvier. — Type : Upper premolar 4 and molars 

 1-2. Paris, No. 2346, Loc, Moissac, Upper Oligocene (Fig. 5). 



Definition : Dentition \ \ ^i^ f ; upper incisors small ; lower canines sub-tri- 

 angular ; with flat outer and sharp inner edge, procumbent ; first lower premo- 

 lars variable ; upper and lower premolars 2-4, with two crests resembling the 

 molars ; upper premolars with small antecrochet, with crista and crochet ; up- 

 per molars with crista (soon disappearing), pointed crochet (disappearing in old 

 age), antecrochet and postfossette ; cusp or cingule at entrance of median val- 

 ley. Measurements : type p'^-m"'' = 100 ; pg-nig = 173 ; p^-m' = 173-180. 



This represents the Upper Oligocene species of the French 

 and German Museums, which are readily distinguished from the 

 Lower Oligocene species by the complication of the teeth ; but 

 exhibit little or no increase in size. In Paris are Cuvier's types 

 described in the ' Ossemens Fossiles ' ; also a cotype lower jaw 

 No. 2343 ; also Duvernoy's R. pleuroceros (synonym) type skull 

 from Gannat. The finest series of upper and lower teeth are 

 those in the Munich collection from Eselsberg and Eckingen 

 near Ulm, which are catalogued as A. croizeti Pomel. In the 

 Stuttgart collection from the same localities we find espe- 

 cially Nos. 4757 and 9861, rightly identified as D. minutum. 



' Unless otherwise stated Paris refers to the Galerie de Paleontologie, Jardin des Plantes, 

 under the direction of Professor Gaudry. 



