THE ALIMENTARY CANAL. q7 
the head of the 
animal, which is 
a gizzard, rather 
than stomach, as 
it has thick mus- 
cular walls arm- 
ed with teeth. A 
well-marked con- 
striction separates 
this organ from 
the intestine. The 
liver is highly de- 
veloped; instead 
of numerous fol- 
licles, there is a 
large symmetrical 
organ, divided in- 
to two lobes, pour- 
ing its secretion 
into the upper 
part of the intes- 
tine, which is the 
true stomach. 
Among Insects, 
there is great va- 
riation in the form 
and length of the 
canal. The fol- 
lowing parts can 
generally be dis- 
Fie. 38.— Anatomy of a Caterpillar: g, h, esophagus; h, 
i, stomach; &, hepatic vessels; 1, m, intestine; q, 7, 
salivary glands; p, salivary duct; a, b, c, longitudinal 
tracheal trunks; d, e, air-tubes distributed to the vis- 
cera; f, fat-mass; v, 2, y, silk-secretors; z, their ex- 
cretory ducts, terminating in ¢, the spinneret, or fu- 
sulus, 
tinguished: gullet, crop, gizzard, stomach, and large and 
small intestines, with many glandular appendages. The 
crop, gizzard, and large intestine are sometimes absent, 
especially in the carnivorous species. In Bees, the crop 
is called the “ honey-bag.’ 
> The gizzard is found in In- 
