go MCMURRICH. PYOL. XIV: 
The tendons pass between, and apparently in some cases (see 
Ide’s Fig. 64) through, the epithelial cells of the intestine, to be 
inserted into the chitin lining the interior of the gut; and it 
may reasonably be assumed that they are produced by cells 
which were at one time, at least, a portion of the epithelium of 
the cesophagus or rectum. If the ectodermal cells of the sto- 
modzum and of the terminal portion of the proctodzum can 
produce these tendinous structures, we can readily understand 
how the cells of the anterior portion of the proctodzum, since 
this is in reality the true significance of the ‘‘midgut,’”’ may 
produce the fibres. 
Since the above lines were first written I have received, 
through the courtesy of the author, a paper by Bergh ('96), in 
which he-describes the occurrence of supportive fibres in cer- 
tain Infusoria. How far they agree with the fibres I have just 
discussed remains to be seen, but it is nevertheless interesting 
to find intracellular supporting fibres in other forms than the 
Isopods. 
The Cytoplasm. — In examining a surface view of the ‘“ mid- 
gut’ (Fig. 1), each of its large nuclei seems at first sight to be 
approximately in the centre of a more or less quadrangular area 
of cytoplasm, each area being separated from its neighbors by 
well-defined boundaries. On further examination, and on alter- 
ing the focus to a deeper level so that the bases of the areas 
are brought clearly into view, the boundaries almost disappear, 
FG: x. 
and the impression that one has to do with rows of distinct 
cells becomes more feeble. This results from the fact that the 
areas, or cells, are somewhat dome-shaped, and the chitinous 
cuticle is moulded over the surfaces of the domes, as is repre- 
sented in the annexed diagram. Consequently, when the middle 
of the cell and its nucleus are in focus, as when the optical sec- 
