146 
Sir Everard Home on the double organs of 
Fig. 4. A small portion of the same ovarium ; magnified 
five diameters. 
Fig. 5. Anterior view of a portion of the ovarium, testicles, 
and the air bladder of the conger ; natural size. 
Fig. 6. A small portion of the same ovarium ; magnified 
five diameters. 
Fig. 7. A very small portion of the same ; magnified fifty 
diameters. 
Plate XVI. The Earth Worm. 
Fig. 1. Exhibits a posterior or back view of a dead worm, 
in which state it is contracted ; magnified two diameters. 
Fig. 2. An internal view of the same worm laid open from 
behind ; magnified two diameters. 
Fig. 3 . The upper portion of the same parts ; magnified 
four diameters. In the middle line lies the great artery and 
the six lateral cells carrying red blood, and communicating 
between the great arterial and trunk, and the venal one on 
the opposite side or belly : the artery passes up to the head on 
the outside of the glandular mass surrounding the oesophagus, 
and through the space between the three portions of which 
the brain is composed, to go down the opposite or belly side 
of the animal. Immediately on the outside of the three lowest 
arterial cells are the ovaria and testicles. As the animal is 
divided through its whole length by decipimenta into com- 
partments, one ovarium and one testicle lies on each side 
of the same compartment with the fourth arterial cell, and 
one testicle and ovarium in the same compartment with the 
fifth. In the sixth, there is an ovarium but no testicle. In the 
compartment below the arterial cells is one ovarium on each 
side very much developed, and directly between them is a hard 
cartilaginous circle, through which the oesophagus passes. 
