i)6 Mr. Home’s Observations on the Structure 
Immediately beyond the pylorus there is a dilatation of the 
gut, which both Cuvier and Hunter call a cavity belonging 
to the stomach. It must however be considered as duodenum, 
since the common duct of the liver and pancreas opens into 
it ; the longitudinal valvulre conniventes have their origin in it ; 
and there is no transverse constriction any where beyond it, 
to mark the beginning of an intestine. Such an enlargement 
of the duodenum is very common in other animals, and has 
been described in the account of the camel. The coats of this 
portion of the duodenum are thicker than those of the fourth 
stomach. The annexed drawings (Plate III.) will give a 
better idea of these different parts than can be conveyed bjr 
any verbal description. 
The number of cavities constituting the stomach are not 
the same in all animals of the whale tribe. In the com- 
mon porpoise, grampus, and piked whale, the number is the 
same as in the bottle-nose porpoise ; but in the bottle-nose 
whale of Dale there are two more cavities. This variation is 
however by no means material, since the general structure of 
the stomach is the same. 
In all of the whale tribe there is one cavity lined with a 
cuticle, as in the bullock and camel. 
In all of them there is a second cavity made up of a very 
glandular structure. In the porpoise, grampus, and large 
bottle-nose whale this structure resembles that which is above 
described. In the piked whale the rugas are longitudinal and 
deep, but in some places united by cross bands ; and as the 
piked whale has whalebone teeth, the great whalebone whale 
will probably, from the analogy of its teeth, resemble it in 
the structure of its stomach. 
