KATHLEEN HADHON. 
;W8 
'L’his last factwould seem to prove that Steenstnip (12) was right 
in his statement tliat the “Ford^ielsesvej” (literally 'Svay 
of digestion ”) goes through the stalk. As Hansen (5) points 
out, he avoids calling this system the gnt, for in a degenerate 
form like this no definite gut can he traced. Sections in this 
region show that these canals have very thick walls, which 
might be the remnants of gut epithelium — an additional reason 
for supposing that these spaces have a nutritive function. 
^riie minute structure of the portion of the pamsite em- 
bedded in ihe host has been the subject of a good deal of dis- 
])ute. According to Levinsen (9), it is surrounded by a thin 
cuticle which appears to arise in the region of the sucker, and 
Jensen (6) describes this cuticle as being a direct continua- 
tion of the sucker, and pressed against the bent-up portion of 
it; Hansen (5) agrees that this suggestion is ])lausible, but 
points out that Jensen does not draw this cuticle separate 
from the skin he describes as formed by the worm round the 
parasite (6) (fig. 10). Jansen further suggests that it is this 
mem brane, formed by the worm, that Levinsen described as the 
cuticle of the parasite, but Jensen considers it to belong to 
the host on the grounds that a section shows that the cells 
forming it lie to the outside, that is on the side remote from 
the parasite. In this connection he refers to Giard and 
Bonnier,^ who describe a similar formation among crabs 
infected by Butoniscans. Hansen, however, does not believe 
that there is any other skin than that belonging to the para- 
site, and fails to find any trace of a membrane arising fi-om the 
worm. He believes that an apparent membrane is due to the 
tissues of the worm being pressed against the roots of the para- 
site ca.iising a certain amount of degeneration, and compares 
it with Rhizorhina,^ the roots of which pass into the gills 
of Am pel i seas with no trace of membrane round them. 
A careful study of my sections leads me to believe that 
^ Giard and Bonnier, ‘ Contri])utions a I’etude des Bopyriens," 1887, 
p. 97. 
2 Hansen, H. J., ‘■Rliiy.orliina ainpelisca',” ‘ Ent. Meddel,’ Ills, 
H. 5, 1892, p. 207. 
