314 
THE IGUANODON 
but they offer very gigantic proportions. Of 
the sternal apparatus nothing certain is known, 
except that a small sternum so closely resembles 
that of a lizard, that it may be inferred the 
coracoids and omoplates possessed a similar an- 
alogy ; but no characteristic portions of the lat- 
ter have been observed. The supposed clavicle is 
very peculiar, and of a most extraordinary cha- 
racter. The bones of the extremities approach 
very nearly to those of the Iguana ; and the pha- 
langes terminate in claw-bones, as in the recent 
animals. 
To assist the attempt to estimate the size of the 
original animal, I have constructed the following 
table, wliich exhibits a comparative view of the 
dimensions of the corresponding bones in an Iguana 
5 feet long, and in the Iguanodon : — 
BONES. 
RECENT IGUANA 
FIVE FEET LONG. 
IGUANODON. 
Length of the 
original, as 
indicated by 
the compa- 
rison. 
Exceed the 
recent by 
Teeth . 
• • • 
• • • 
20 times. 
100 feet. 
Horn . 
4 inch high. 
inch. 
18 — 
90 — 
Os tympani 
0*6 inch high. 
6 inch. 
10 — 
50 — 
Clavicle 
1 i inch long. 
30 inch. 
20 — 
100 — 
" 
Circumference 
I I 
of the shaft 
J- 2 3 inch. 
Femur . - 
inch. 
J 
- 
15 — 
75 — 
Length of the 
bone SA in. 
Tibia . 
2‘8 inch. 
31 inch. 
n — 
55 — 
Claw-bone 
. 
. 
16 — 
80 — 
