On some Characters of the Hunting Leopard. 419 
in section as in the mandrill and Theropithecus ; its antero- 
posterior diameter is 18 mm., that from side to side 16 mm. 
There is a very strongly developed linea aspera. 
The astragalus has a much less prominent flange on the 
inner side beneath the tibial facet and the surface for the 
internal maleolus is more concave than in the astragali of 
baboons with which it was compared. 
The calcaneum does not present any special peculiarity ; its 
length is 49 mm., in the mandrill skeleton used for com- 
parison it is 46mm. The cudoid is longer and narrower 
than in the mandrill. 
So far as they go, the limb-bones seem to indicate that 
there probably was considerable difference in size in the 
sexes, the male being a very large and powerful animal. 
EXPLANATION OF PLATE XV. 
Fig. 1. Anterior portion of skull of Simopithecus oswaldi, from right side. 
(Type-specimen.) # nat. size. 
Fig. 2. Ditto, palatal view. 2? nat. size. 
Fig. 3. Right upper molars of a younger individual. Nat. size. 
Fig. 4. Mandible, from left side. ? nat. size. 
Fig. 5, Lower molars and premolars. Nat. size. 
Fig. 6. Lower canine of male. Nat. size. 
c., canine; pm. 3-4, third and fourth premolars ; m. 1-5, molars. 
XLVII.—On some of the Cranial and External Characters 
of the Hunting Leopard or Cheetah (Acinonyx jubatus). 
By R. 1. Pocock, F.R.S., Superintendent of the Zoological 
Society’s Gardens. 
Since 1830, when the hunting leopard, commonly known in 
England as the cheetah, was severed by Wagler from the 
genus Felis under the name (ynailurus, there has been almost 
complete unanimity with regard to its claim to generic rank. 
In a great majority of text-books, monographs, and syste- 
matic lists it is quoted as Cynelurus ; but the oldest available 
title appears to be Acénonyx, proposed by Brookes in 1828 *. 
* Quoting from Palmer’s Index, the full synonymy is :— 
Acinonyx, Brookes, Cat. Anat. & Zool. Mus. of Joshua Brookes, p. 33 
(1828); Burnett, Q. J. Sci. Lit. & Art, xxviil., 1829 (1880). 
Cynailurus, Wagler, Nat. Syst. Amph. p. 30 (1830). 
Guepardus, Duvernoy, L’Institut, Paris, ii. no. 51, p. 145 (1884). 
Cynofelis, Lesson, Nouy. Tabl. Régne Anim., Mamm, p. 48 (1842), 
