392 
KATHLEEN HAUUON. 
results : tlie top figures giving the length iii imn. of the 
roots, whilst those below give that of the external portion : 
5 5 4-5 4;5 4 1 A ^ JA 
^ 2 rs rs 2 re fs rs Fe rs T 
showing that the root system is from two to three times as 
long as the part outside the worm. He therefore concluded 
that there is a definite body inside the worm which is con- 
nected with the external parasite, and is either part of the 
parasite or a pathological formation caused by it, but that 
the former is the case as this structure is always the same 
shape, it lies free in the worm’s body, and is proportional in 
size to the external body. Other observers — Hansen (3) 
and Jensen (6) — also figure the roots as being in direct 
communication with the external part of the parasite. 
The suggestion that the internal part of the parasite had 
a nutritive function was put forwai'd by Levinsen (9), but this 
question will be dealt with in the next section, together with 
a description of its structure. 
3. Microscopical Structure. — The first specimens cut 
were unfortunately detached from their host, as I did not then 
know that any part of the parasite was within the worm ; sub- 
sequently the worm was cut at the same time as the parasite. 
The specimens were first stained in paracarmine, dehydrated 
and cleared, and then as much as possible of their structure 
was studied and drawn before they were sectioned ; after 
being cut the sections were stained on the slide in htemalum. 
(a) External Part. — Examined as a solid object the 
anatomy of this portion of Herpyllobius is not easy to make 
out. The body is always covered by thick structureless cuticle 
from which the internal organs frequently shrink away. In 
most forms (FI. 22, fig. 3) the body is almost filled with a mass 
of eggs, which may show clear spaces running through it, all 
converging at the point where the stalk arises, in which place 
there is often an opaque structure which l uns down the stalk 
and may extend up the clear spaces. The strong chitinous 
buttresses that support the egg-sacs are well supplied 
