1870.] ANATOMY OF THE PRONGBUCK. 361 
inches. 
Vertical depth of the anterior nares ..........0.+.00000. Lez 
Vertical depth of the posterior nares) ...........-0..00. 1‘6 
Distance between tips of horn-cores ............ 00.0005. 9-0 
Benat tet hat enre ty ts2 Gj «tgs Aa tye dak hie inwas 0 5:0 
Its greatest breadth—that is, where srs is i off—in dif- 
ferent skulls from .... sthys erate outoy 22°0 
Distance between roots of oe ACOLES A Si2ise ao taat Oe iS. s-6 Bien 2:5 
(ce) Inferior maxillary bone.—Dr. Gray’s figure of the mandible 
(Cat. of Mam. B. M. 1852, tab. xv. fig. 1, Dieranoceros furcifer), 
though small, sufficiently indicates the peculiarities of outline dis- 
tinguishing this bone. As is therein shown (and in the present 
fig. 6, B), the direction in which the ramus rises and recedes from 
the body i is more backwardly oblique than in most Ruminants; and 
this is rendered the more apparent by the unusual rounding-off of 
the angle. ‘The coronoid process is long, narrow, and straicht, or 
wanting in that convexity of its upper border met with in most Cer- 
vidze and Bovide. The sigmoid notch is both short and shallow, 
and the rather flat-topped facet of the small condylar head almost 
deficient in neck, whilst its transverse and antero-posterior diameters 
are not great. The ramal angle, as mentioned above, is the reverse 
of prominent, and possesses in some specimens a widish but shallow 
emargination towards the body end. 
The dental portion of the body is only moderately deep behind, 
and is concave below forwards to the diastema. Thisis long, later ally 
compressed, and relatively deep, with a sharp upper border ; the 
terminal incisive expansion is of moderate breadth. 
The dimensions of the mandible are :— 
inches. 
Extreme length fromcoronoid process to cutting-edge of incisors 10 
Length from the angle to the roots of the incisors ........ 
Distance from the front of symphysis to first premolar... .. . 
Haw of lower erindine-tecta. ve on. pee yep een as SoRe 
Vertical height, a line being dropped from coronoid process . . 
Penotn or COrouoid. PrOCess’ o3. 52st stad ek eet et 
Depth of the bone at the middle of the last molar ........ 
Breadth of the bone at'the angle 27.0000. 002003. 0 00. 
(d) The skull of Rupicapra contrasted with that of Antilocapra.— 
The Prongbuck has been closely associated with the Chamois by 
most classificators of the Artiodactyla, chiefly because of the upright 
and supraorbital position of the horns, and recurvation of their tips. 
Mr. Turner, who, in his ‘ Generic Subdivision of the Bovidee,’ has 
dwelt more generally on the characters of the skull, still considers 
them in some degree allied, and follows Dr. Gray in ranking them 
and others under the title of caprine Antelopes. The cranium of 
each, no doubt, has some characters in common ; but in many points 
the differences are as well pronounced. 
Among other features, the skull of the Chamois compared with 
that of the Prongbuck shows the following divergences :—1. The 
a ea ay ee or 
akUNNH SH 
