302 
A. G. BOURNE. 
ing the following lohes 1, main lobe \ 2^ apical lobe \ S, 
testis lobe ; 4, recurrent lobe. 
3. The cells which constitute the gland are all penetrated 
by ductules, which pass through them, sometimes forming 
several passages ; the ductules differ in the different lobes of 
the gland. 
4. The axis of all the lobes is occupied by a large duct 
separated from the nephridial cells by a thick cuticle ; it 
opens into the vesicle duct, but is not shown to have any 
connection with the ductules. 
5. Vessels of the haemal system (with red fluid) form a 
complete plexus in the gland, each cell being surrounded by 
a loop of the plexus. 
6. There is no internal opening of the system of ducts or 
ductules. 
7. There are no cilia in any part of the gland excepting 
the vesicle, which is lined by a ciliated epithelium. 
8. The wall of the vesicle is muscular; that of the gland 
is not, but consists of a fibrous, pigmented investment. 
