110 
PEOFESSOE OWEX ON THE SCELIDOTHEEE. 
Comparative Table of Dimensions of the Skull of the Scelidotheee, Mtlodon, and 
Megatheee. 
Scelidotherium 
leptocephalurn. 
ilylodon 
robustvLS. 
"Megatherium 
americanum. 
Cranium. 
ft. in. 
lin. 
ft. 
in. 
lin. 
ft. 
in. 
lin. 
Length from the occipital condyles to the fore-end of the upper 
jaw 
1 8 
4 
1 
6 
6 
2 
7 
0 
Length from the occipital condyles to the fore-part of the 
malar bone 
0 11 
6 
1 
2 
0 
1 
8 
0 
Length from the fore-part of the malar bone to the fore-end 
of the upper jaw 
0 8 
8 
0 
5 
0 
0 
10 
® i 
Breadth across the widest part of the zygomatic arches 
0 7 
0 
0 
10 
9 
! 
Least breadth at the interspace of those arches 
0 3 
7 
0 
5 
4 
0 
6 
0 
Breadth of the fore-part of the nasal bones 
0 2 
8 
0 
3 
3 
0 
4 
6 
Mandible. 
1 
1 
Length 
1 6 
6 
1 
3 
6 
2 
3 
0 1 
Breadth between the hinder ends (angles) of the rami 
0 4 
7 
0 
6 
3 
0 
7 
0 ! 
Breadth between the condyles 
0 1 
8 
0 
4 
2 
0 
4 
0 
Breadth between the posterior sockets of the teeth 
0 1 
6 
0 
2 
10 
0 
2 
3 
Breadth between the anterior sockets of the teeth 
0 1 
8 
0 
4 
0 
0 
1 
9 
Breadth across the fore-part of the symphysis 
0 2 
5 
0 
5 
4 
0 
4 
5 
Depth of ascending ramus from the upper part of the condyle 
0 5 
8 
0 
5 
7 
1 
5 
0 
Depth of ascending ramus at the fore-part of the base of the 
coronoid process 
0 3 
7 
0 
3 
7 
0 
9 
0 
Depth of horizontal ramus at the fore-part of the first socket .. 
0 2 
7 
0 
3 
0 
0 
8 
0 
Length of the symphysis following the outer curve 
0 7 
3 
0 
4 
3 
1 
1 
0 
Fore and aft extent of base of coronoid process 
0 3 
9 
0 
3 
8 
0 
9 
0 
From the back part of the condyle to the end of the angular 
process 
0 3 
6 
0 
3 
2 
0 
6 
0 
From the end of the angular process to the last socket 
0 6 
5 
0 
6 
6 
0 
9 
7 
From the first socket to the anterior margin of the jaw 
0 7 
10 
0 
3 
6 
0 
9 
0 ! 
Extent of the alveolar series 
0 4 
4 
0 
5 
4 
0 
9 
0 
Breadth of the condyle 
0 1 
10 
0 
2 
6 
0 
3 
0 
Desceiption op the Plates. 
PLATE VIII. 
One-fourth nat. size. 
Fig. 1. Side view of the cranium, with the malar bone, in outline. 
Fig. 2. Side view of a cranium, wanting the malar bone. 
Fig. 3. Side view of upper molars. Nat. size. 
Fig. 4. Side view of the mandible. 
Fig. 5. Upper view of the mandible. 
PLATE IX. 
Nat. size. 
Fig. 1. Base view of skull. 
Fig. 2. Grinding surface of the upper molars. 
Fig. 3. Grinding surface of the lower molars. 
