ELEDONE. 501 
dilation or crop. ‘This is also lined with chitin, and 
folded, and serves as a food reservoir when the stomach 
is full (fig. 18, cr.). At the base the oesophagus dilates, 
and its wall and chitinous lining become smooth. (To 
expose the anterior part of the oesophagus it will be 
necessary to remove the ventral wall. of the cranial 
cartilage and the sub-oesophageal ganglia.) 
Salivary Glands.—Hledone has five salivary glands: 
1. Anterior salivary glands, 1 pair, closely applied 
to the external surface of the buccal mass, posteriorly 
aoe? 7.5.9). 
2. Posterior salivary glands, 1 pair, situated at the 
side of the crop (fig. 17, 7.s, g,, and fig. 38a, s, g,). 
3. One sub-lingual and median salivary gland, 
situated in the ventral wall of the buccal mass (fig. 24, 
SAAN 
These glands are granular in appearance, soft and 
spongy in texture, and of a translucent whitish colour. 
The anterior pair is much smaller than the posterior, and 
is attached in the angle between the oesophagus and 
buccal mass (PI. IV, fig. 20, s.g.). They are flattened oval 
glands, bilobed posteriorly, and are about [6x12 mm. in 
large specimens. The duct leads from a slightly elevated 
ridge on the internal surface, inwards to the pharynx, 
and is very short. Along with the duct, the artery and 
nerve of the gland enter by this ridge (Pl. IV, fig. 22). 
The posterior glands are large and flattened, and the 
crop must be turned aside to expose them fully. They 
are attached to the visceral sac by a suspensory ligament. 
The duct leaves the anterior internal region where there 
is a slight depression. Here also enters the artery of the 
gland (Pl. IV, fig. 21, s, g, d,). They measure about 
32 mm. X 26 mm., and the duct after a short course joins 
its fellow to form an unpaired median “ posterior salivary 
KK 
