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generation of the lamprey , the conger eel , &c. 
The other compartments contain membranous bags for the 
reception of ova. The two lowest ovaria are hanging loose. 
Before the breeding season they are empty. Towards the 
lower part, on each side, is the cut edge of the lateral slit, by 
means of which the animals adhere in the act of copulation. 
In this space are included six compartments : in each of 
these is a large conspicuous gland of an oval form. 
The course of the oesophagus, crop, gizzard, and intestine, 
can be traced behind the great artery. 
Plate XVII. The Earth Worm. 
Fig. 1. An anterior or belly view of the perfect worm 
after death ; magnified two diameters. 
Fig. 2. The internal parts of the same worm : magnified 
two diameters. 
Fig. 3. The same parts for a certain extent ; magnified 
four diameters. 
At the upper part is seen the brain, on each side of which 
go down two nervous elongations from two spherical gang- 
lions situated on the opposite side to form the spinal marrow, 
which in this animal runs along the belly. 
The spinal marrow is traced through its course, showing 
the artery belonging to its coats. 
Many parts already described are seen in this view. 
The lower developed ovaria appear in this view suspended 
upon the decipimentum. Immediately below them the termi- 
nation of the oesophagus is seen, under which is the crop, 
then the gizzard, leading to the intestine. 
