448 E. A. ANDREWS. 
cord to the intestine in each somite. Here, in the intestine, 
the nerves were lost, and could not be followed into any con- 
nection with the main trunk of the animal. The nerve-cord 
ends bluntly as an upturned mass, suggesting a former con- 
nection with, and rupture from, the main ventral] nerve-cord of 
the animal. 
The lateral nerves that run out in the epidermis to the para- 
podia are found in the first somite as in the others, but there 
is no indication of any lateral nerve establishing a connection 
between the ventral nerve-cord of this dorsal terminal and the 
nerve-cord in the main trunk. 
To determine if this peculiar behaviour of the nerve-cord was 
found in the other two specimens, B and C, they were prepared 
and cut into serial sections, crosswise. It was then easy to see 
that the same conditions obtained here as in specimen A. In 
both B and C the body-cavity bifurcates, and the digestive tract 
bifurcates and runs out into each terminal as if to an anal 
opening (which, however, was not demonstrated). Yet the 
nerve-cord does not bifurcate, but passes directly into only one 
of the terminals, the left one in each case. 
The other terminal, the right, has its normally formed nerve- 
trunk that stops near the base, with no indication of any direct 
connection with the main system. 
In other respects the two terminals in B and C are normal 
and alike. The dorsal and ventral blood-vessels and the 
muscles are all perfectly normal; and the body-cavity, as in 
the more anterior region of the body, contains large masses of 
young reproductive cells, sperm mother-cells, in each terminal. 
In these three specimens we find the terminals normal repe- 
titions of the posterior end of the body, except that the more 
dorsal terminal, the one more to the left in A, but the one 
more to the right in B and C, has no apparent connection with 
the nervous system of the anterior part of the body, and is thus 
isolated in a peculiar manner. This isolation was entirely un- 
expected, since in all other cases of bifid Annelids the nerve- 
cord, as far as there are any statements made about it, is said 
to bifurcate also and to send a branch into each terminal. 
