192 INTESTINAL STRUCTURE OF ICHTHYOSAURUS. 
of the stomach was nearly co-extensive with the 
trunk. 
Among living voracious reptiles we have ex- 
amples of stomachs equally capacious ; we know 
that whole human bodies have been found within 
the stomachs of large Crocodiles ; we know also, 
from the form of their teeth, that the Ichthyo- 
sauri, like the Crocodiles, must have gorged their 
prey entire ; and when we find, imbedded in 
Coprolites derived from the larger Ichthyosauri, 
bones of smaller Ichthyosauri, of such dimen- 
sions, (see PL 15, Fig. 18. And Geol. Trans. 
2, S. vol. iii, PI. 29, Figs. 2, 3, 4, 5,) that the 
individuals from which they were derived, must 
have measured several feet in length ; we infer 
that the stomach of these animals formed a pouch, 
or sac, of prodigious size, extending through 
nearly the entire cavity of the body, and of 
capacity duly proportioned to the jaws and 
teeth with which it co-operated. 
tube upon its inner surface, (PI. 15, Fig. 3',) scarcely visible 
without a microscope, showed it to have been one of those 
which form the lateral line of perforated scales, that pass from 
the head towards the tail, one on each side of every fish; and 
convey a tube for the transmission of lubricating mucus from 
glands in the head, to the extremity of the body. The place 
of the scale in this line, had been on the left side, not far 
from the head. Fig. 3" is the upper surface of a similar scale, 
showing at e the termination of the mucous duct. 
