- of the Pronghorn (Antilocapra americana). 403 
from the epidermis, the skin remaining complete underneath 
them. 
Two other points in which the Pronghorn differed from all 
the other known Bovide were the furcation of the horns and in 
the absence of the “ false hoofs,” as the stunted terminations of 
the rudimental second and fifth digits of each foot are termed, 
in which latter respect it resembled the Giraffes (Camelopardalis). 
These three important modifications of structure, when taken 
together, induced the author to believe that it would be neces- 
sary to raise the genus Antilocapra to the rank of a family in 
the series of Ruminantia, which he proposed to arrange some- 
what as given in the subjoined table. 
Order ARTIODACYLA. 
Division RUMINANTIA, 
I. RUMINANTIA PHALANGIGRADA. 
Placenta diffusa. Stomachus tripartitus: dentes 
3 ; 1-1 - . l—l iat 6—6 5—5 
primores 3—,3; canlml ;—, Molares g¢—-G aut 5-6: 
pedes didactyli ............. Socenacaeuioncn sartessccsseces |, Cometide. 
II. RUMINANTIA UNGULIGRADA. 
a. Placenta polycotyledonaria.. Stomachus quadri- 
ian deat : ; oO 0n - « 0O—0 t 
partitus: qdentes primores 3-3? caninl T=1 au 
tT 6 
6= 
ae molares =a 
a’. Pedes didactyli, ungulis succenturiatis nullis. 
a", Cornua in sutura coronali posita, ossea, 
brevia, pelle tecta ......ss.ssscesseeee fenke eh 2. Camelopardalide. 
b”. Cornua ex osse frontali orta basi ossea, 
parte superiore cornea, furcata, decidua . 3. Antilocapride. 
6’. Pedes tetradactyli, ungulis succenturiatis 
duabus. 
(c”. Cornua ex osse frontali orta, basi ossea, 
parte superiore cornea, non furcata, per- 
SAGMERGIAG  ebiicnvoaaretéstadacacss nas sortves ase 4. Bovide. 
< d''. Cornua ex osse frontali orta, omnino 
OSSGAe OC CIOM EAT ose ac cists esses sels sferae sielacicly eoratta 5. Cervide. 
e’. Cornua nulla, dentes canini marium 
WP CeMSE RENT ef diees sdcadhonedeeesenccarageeelass 6. Moschide. 
b. Placenta diffusa. Stomachus tripartitus; dentes 
, 0—0 Ses 6—6 
primores 3-33 canini;—,, molares g—G; pedes 
tetradactyli; cornua nulla ......ceccceceeees sccsscsee /. Pragulide. 
In conclusion the author called attention to the geographical 
distribution of the Ruminants, as shown in the subjoined table, 
in which the geographical divisions employed were the same as 
those used by the author in his paper on the distribution of 
