SOME ABNORMAL ANNELIDS. 455 
third left parapodium back nearly to the anal end in a some- 
what oblique course. 
The dorsal blood-vessel is plainly seen in this process and 
left terminal as well as in the main trunk and in the main 
terminal. The vessels contract in each terminal with about 
the same rhythm, so that blood flows simultaneously from each 
forward into the anterior region of the body. 
In other respects the lateral process has the normal appear- 
ance of a normal terminal, excepting that the anal piece and 
the anal cirri are smaller than in the main terminal, appearing 
to be young. 
The ventral surface shows a ventral blood-vessel that bifur- 
cates to enter each terminal, and there is also an indication, in 
the live specimen, that the ventral nerve-cord also bifurcates. 
When the lateral terminal was touched it contracted, and 
sometimes there was also a movement of the anterior region, but 
rarely was there any movement of the posterior region or 
locomotion of the entire animal. If the anal region of the 
main terminal was touched a locomotion of the entire animal 
was pretty sure to follow. 
When not stimulated the animal exhibited but little 
motion. 
As seen in fig. 16, the number of setigerous somites is 16 
anterior to the bifurcation, 14 in the lateral terminal and 25 
posterior to it, making a total of 45, of which 31 are in the 
main axis and 18 in the lateral duplication. 
The entire length, in life, was 103 mm.; the length of the 
process 2 mm. This process springs from the 17th seti- 
gerous somite at a point 4 mm. posterior to the head end 
and 63 mm. from the anal end. 
An examination of the internal anatomy shows that the 
process has the normal organs; its digestive tract is a branch 
of that in the main trunk; the nerve-end is a branch of the 
main cord ; the body-cavity is filled with a number of sperm 
mother-cells. There is a complete bifurcation or branching of 
all longitudinal organs in such fashion that each terminal gets 
one branch; those to the smaller terminal appear as side 
