438 E. A. ANDREWS. 
with the right ventral line of the main terminal. This con- 
tinuity of structure from trunk to terminals is seen again in 
the body-walls and in all longitudinally elongated organs. 
Thus in fig. 4 we see the muscle fibres of the longitudinal 
system of the dorsal body-wall passing from the trunk into both 
terminals. 
Dissections and longitudinal sections of the terminals and their 
union with the trunk show that each is perfect in all the organs 
of a normal posterior end of an earthworm aud that all the lon- 
gitudinal organs of each terminal become continuous with 
those of the trunk. Thus, as seemed apparent from the 
surface (fig. 3), there is an anal opening for each terminal. 
The short right one has, like the larger one in each of its 
somites, the normal character and arrangement of body-wall, 
septa, digestive tract, blood-vessels, nerve cord, nephridia, and 
sete. The nephridia terminate in nephrostomes and pass into 
the body-wall, presumably to open to the exterior, though this 
was not seen in the sections. 
The only departures from normal structure are found in the 
peculiar rings 74 and 75. The digestive tract, as shown some- 
what diagrammatically in fig. 5, sends out a large branch into the 
right terminal ; the dorsal blood-vessel does the same, and so 
does the ventral or subintestinal vessel, as was demonstrated in 
serial sections. The ventral nerve-trunk bifurcates in such a 
way that fibres pass from each of the three diverging trunks 
into each of the other two. The “ giant fibres ’’ also pass from 
one to the other; fibres from the trunk or body pass into each 
terminal and fibres pass from each terminal across into the 
other terminal. All this takes place in a nerve mass but little 
smaller than and not unlike the normal, except where the actual 
separation of the fibres takes place. 
The ventral nerve thus formed as a lateral outgrowth from, or, 
more accurately, as one fork of the nerve-cord of the body, has 
in each terminal the normal ganglionic swellings for each 
somite. 
The septa that subdivide the body-cavity are normal in posi- 
tion and structure in the body and in each terminal except in 
