Progress in Mammalian Palaeontology . — Osborn. 211 
France, have been perhaps extended by discovery of the 
Notostylops beds in Patagonia (Ameghino 1 ). Faunal unity 
with the extremity of' South America if confirmed will be 
of great significance ; it appears to be probable but perhaps 
not absolutelv demonstrated. 
.PROVISIONAL PHYLOQENY OP RHINOCEROTOlDEA , AMERICA AND EURASIA. 
■it m 
AMWOOOrYT. HHMCODOHT. 
Recenr 
I. RHIH0CERO7IDAC 
A 
Sim us 
buoTnis 
3 mdicus 
R sondaims 
PLE'STOCeJt, ■ 
ELA5N0THE«IU'> 
anliquiTaJii 
mer^kif 
Puoccite 
Taofdju 
D.platjrfhinus 
ttruSCus 
liofoihinus 
D .wMatnntdiii 
D.sfeintnimtnn"i 
f? siwalcnsis 
R palannauu* 
ixumayTi 
D pqtKyqnal>ni 
A SupOtlllOSU' 
AiMlocorinu 
l.UUaduffluu 
A. mfoolodus 
douvil'ti 
adrcnum 
A lonamnse 
T. peisiac 
Tbracfypus 
T maj'o r 
T. foss ioer 
fmtdiCOrnufus 
Tau'tliamnsis 
D Simoncnsis 
0- sansanitnsis 
mmulurr 
CAENOPUS 
TRlGONlAS 
A filholi 
CAOUffCOTXf «'« 
METAMWWOO. 
HVRACO0OY 
rtPHtlOPi 
Qlnui 
OlCEfiAT/lERlu* 
Stnui 
kcaicnuw 
TtLEOCERAS 
Holchi 
(knui 
DlCE«0RMINUS 
GU r , 
0ICER0S 
iV A"i">'* 
EurOpi i*J Ana, Ewopt. 
Ana. iNAmcrirt 
Europt 
Ana. 
On, 
RHINOCEROS AMT/VOOCiV 
HrttACHrUS 
£oce»e <**3 
Afrira , 
Europt 
Axo. 
N An.tr., 
Eu 'opt 
M An 
FIG 3. 
The Polyphyletic Law Illustrated in the' Rhinoceroses. 
The Rhinocerotoidea early divided into the Hyracodontidae ' (Mi), known 
only in America, Amynodontidae (ii), known in .America and Europe, and 
the Rhhwcerotidae (i). The last family of true rhinoceroses prove to 
include at least seven distinct phyla corresponding to seven genera which 
extend back as far as the Middle Miocene if not into the Oligocene. 
The most important single phylogenetic result is the 
strong evidence which has been brought forward for the 
ancestral relationship of the Taeniodonta (Ganodonta) of the 
Torrejon to the Gravigrade Edentata (Wortman*), borne 
out by careful comparison of many parts of the skeletons 
of Psittacotherium and allied forms with those of the gravi- 
grade sloths. Indirect proof of the early existence of 
1 (Juadro Sinoptico de las formaciones terciarias y cretaces de la Argen- 
tina. An. Mus. Nac. d. Buenos-Aires, t. viii, Julio, 1902. 
2 The Ganodonta and their Relationship to the Edentata Hull. Amer, 
Mus. Nat. Hist., vol. ix, 1897, pp. 59-11 
