360 DR. J. MURIE ON THE [May 26, 
The basioccipital (Bo) is an inch broad behind, continued for- 
wards with a steady reduction of breadth to the junction of the basi- 
sphenoid (Bs). There is a trace of a middle longitudinal ventral crest 
with wide muscular concavities on either side of it. The so-called 
posterior tubercles of the basioccipital are badly represented, though 
not perfectly obsolete as are the anterior tubercles. 
No shadow of doubt crosses my mind as to the pattern of the 
entire occipital bone, which is modelled precisely as in the Cervidee. 
The supraoccipital in the Antelopes is protuberant and convex ; the 
condyles have a more rounded mesial division ; either the posterior 
or anterior tubercles of the basioccipitals are well developed, the latter 
often very convex and prominent. In Ovide and Capride the basi- 
occipital is flat but wide, quadriform, with pronounced fore-and-aft 
tubercles. The superocciput in Oxen offer some resemblances to the 
Deer and Prongbuck, but their basiocciput is distinctly different in 
having well-developed tubercles and a deep groove between them. 
There is a moderate narrowing forwards of the basisphenoid (Bs) 
in proportion to the breadth of its occipital end, and the bone agrees 
with many Deer and some Antelopes in the amount of convexity 
and lateral guttering. 
The pterygoid plates and processes are thin, widely apart, and 
with obsolete hamular processes. The alisphenoid is narrow fore 
and aft, and the sphenoidal fissures are of great size. The orbito- 
sphenoid plates are less depressed or scooped out than in most simi- 
lar-sized Ruminants ; and as a consequence the orbit appears less 
deep than in many forms. 
The horizontal plates of the palatines (PZ) together form about 
the hinder fourth area of the entire hard palate. Their sinuous 
maxillo-palatine suture presents a wide arch, interrupted by wide 
posterior palatal foramina. Between the last molar, retrocedent an- 
trial process, and the wall of the posterior nares there is an unusually 
deep notch or interspace. 
The vomer is very stout, the inferior turbinate bones uncom- 
monly long and inflated. 
Three skulls of Antilocapra americana in the British Museum 
vary so very little as regards dimensions, that I have thought the 
one obtained from the Gardens might suffice, as undernoted, to in- 
dicate general admeasurements. 
inches. 
Extreme lengilt, (eee pietiiy Mea 4S GIs 6 on aye tee eins 11-3 
Extreme breadth, viz. diameter at posterior rim of orbit ....  5°7 
Diameter opposite hinder ends of premaxillaries .......... 2°0 
Highest perpendicular without mandible, mid-horns........ 3°6 
Height (or depth), vertical, with penultimate upper molar ..  3°3 
Greatest ‘lenpth of maale. oc o55 wi eg > 2012 0s ole nines nine a bee 4°2 
Distance from anterior upper premclar to tip of premaxillaries 3°7 
2:9 
Length of row of grinding-teeth.........-.. 0000 eee eens 
Distance between occipital foramen and semilunar border of 
the; DOSterter MAaNGNGtoca Me nes Si ae. aye os Nip Th ek eee 
Dis ebers 10 fyON Late caste eae cos ican Bon a canal aS CaP anal Bes 1:7 
