F. J. Meggitt 
383 
Through the middle third of the scoles the courses of these six 
vessels are similar. Each runs directly anteriorly half-way along the 
length of its corresponding sucker and then turns back upon itself at 
an exceedingly acute angle to run posteriorly and externally as far as 
the point from which it started. Here it bends anteriorly again and 
runs between the sucker and the external limit of the scolex, slightly 
anteriorly to the farthest point it reached before. Arrived there it 
repeats its first acute-angled bend and proceeds anteriorly again, almost 
in a straight line with its course before the loops; often the two are 
connected by small capillaries. During its whole course minute branches 
are given off to the sucker, and others establish communication between 
the parallel portions. In the anterior third of the scolex the excretory 
system shows no definite arrangement, it forms an immense and intricate 
plexus (Fig. 5, only the larger branches are shown) the branches of which 
anastomose with one another and sub-divide to such an extent as to 
render analysis impossible. 
The two vessels of each pair are first united by a transverse com¬ 
missure (t.c.) each afterwards splitting up into one or more smaller 
vessels which combining with similar branches from the other pairs 
form the plexus. The labyrinth formed by one pair of excretory 
vessels tends to remain separate from that formed by another pair, and 
only communicates with it by large and definite vessels. Such com¬ 
munications ( l.c .) are usually three .on each side, but their position 
varies irregularly. 
Nervous System. 
The nervous system consists of three longitudinal nerve trunks 
running the whole length of the body. In the scolex they converge 
and at the posterior level of the suckers fuse to form a central mass. 
From this six nerves are sent out, one to each sucker. Numerous other 
branches are also given off. Owing to having only one series of sections 
and the consequent necessity of using a general stain, it was found 
impossible to follow out the nervous system with any clearness beyond 
this point. 
' Genital Organs. 
The genital organs may be divided into two groups. The first 
occurs in the space formed by the junction of the three arms, with the 
female genital organs lying near the external parenchyma at the junction 
of arms 2 and 3, and the male organs occupying approximately the 
centre of the space. The occurrence of this group is very spasmodic, 
