DESCRIPTION OF PLATES. 119 
in. Between extreme points of occipital condyles (external angles), 6:1in. From 
the basilar surface, between the occipital condyles to occipital crest, 7°5 in. Height 
of occipital foramen, 1°9 in. Breadth of occipital foramen, 1°8 in. Greatest 
breadth of upper surface of occipital condyle, 2° in. From occipital crest to 
posterior border of posterior core, 1:2 in. Breadth of cranium beneath posterior 
core (distance between outer margins of roots of posterior cores), 12°1 in. Extreme 
distance between fractured extremities of posterior cores, 21°56 in. Transverse 
diameter of posterior core before its expansion, 5°8 in. Transverse diameter of 
root of posterior core, 8°4 in. Thickness of core before expansion, 3:1 in. Great 
diameter (transverse) of posterior branch, 2°5 in. Thickness (vertical diameter) 
of posterior branch, 1°6 in, Chord of are between the origin of posterior branch 
and occipital crest, 3:1 in. Thickness of stem (thickest part) of core, 3°6 in. 
Circumference of core before expanding, 15°8 in. Antero-posterior diameter of 
broken end of anterior core, 4:1in. Greatest transverse diameter of broken end 
of anterior core, 8°2 in. Diameter of base of anterior core, 4°9 in. Breadth of 
cranium beneath anterior cores (at foramen orbitale lacerum), 5°3 in. Between 
inner margins of articular surfaces of occipital condyles superiorly, 1°77 in. Height 
of fossa for insertion of ligam. nuche, 3°8 in. Base of fossa for insertion of ditto, 
6-4 in. Groove between condyles, inferiorly, :45 in. Between outer margin of 
condyles (inferiorly) immediately behind parieto-occipital crest, 2°7 in. From 
grooves behind occipital condyles, inferiorly, to floor of fossa for ligam. nuchee, 
3°7 in. 
Fig. 3.—Sivatherium giganteum. Fragment of cranium, showing 
forehead, orbits, and cores of anterior horns. This is the same specimen 
as figured in Plate XCII. figs. 2 and 2 a.—B.M. 
Antero-posterior diameter of orbit, 4:in. Height of orbit, 2°7 in. Width of 
malar bone, 2°7 in. Width between anterior angles of orbit, 11°2 in. Width be- 
tween outer margins of orbital cornua, 12° in. Long diameter of fractured end of 
right horn, 5°18in. Short or transverse diameter of right horn, 3°10 in. Probable 
width between mastoid processes, 16° in. 
Fig. 4.—Sivatherium giganteum. Fragment from middle of posterior 
horn. This specimen was in Sir Proby Cautley’s collection, and was 
found to correspond to the posterior horn-core in Col. Colvin’s specimen. 
—B.M. No. 39,525. 
Length following curvature, 21: in. Circumference at lower attachment, 18: in. 
Breadth at offset, 8-1 in. Length of offset at base, 5°in. Width of offset at base, 
4-6in. Breadth at fractured upper extremity, 6°8 in. Greatest thickness at upper 
extremity, 2°3 in. 
Fig. 5.—Sivatherium giganteum. Fragment from apex of posterior 
flattened horn.—B.M. No. 39,524. 
Extreme length, 10°6 in. Breadth at base, 84 in. Thickness (extreme), 
1°8 in. 
Annes 
Sivatherium giganteum.—Figs. 1, 1 a, and 1 6.—Fragment of atlas, 
comprising lower arch.—B.M. No. 39,526. 
Extreme length of fragment, 8°3 in. Antero-posterior diameter of lower arch, 
371 in. 
Fig. 2.—Atlas, very perfect.—B.M. No. 39,527. 
Extreme breadth, 8°3 in. 
Figs. 3, 3 a, 3b, and 3 c.—Axis.—B.M. No. 89,528. 
Extreme length, including odontoid process, 7°6 in. Extreme breadth of anterior 
articular surface, 5°7 in. Length of spinal platform, 5°2 in. Height of spinal 
canal, posteriorly, 1°7 in. Breadth of spinal canal, posteriorly, 1°7 in. 
