140 TOKIO KABURAKI 
parenchyma are the fine pigment granules in enormous quanti- 
ties, which are of an irregular outline and of a dirty olive-like 
colour. The pigments, though rather few, occur on the ventral 
side also. 
Body-glands.—situated in the intervening zone bet ween 
the superficial and deep muscular systems are two distinct 
kinds of glands, the mother-cells of the rhabdites and the 
unicellular glands, as already mentioned. On some occasions 
the mother-cells of the rhabdites have a very stout, horny- 
looking cell-wall with a greatly elongated narrow tube tapering 
off into a long process, each of which makes its way between 
the epidermal cells at various points. Due to the action of 
reagents, the cells vary in appearance. In some cases there 
occur such rhabdites as are still contained in the mother-cells. 
The rhabdites vary in form and appearance. Some present 
a slender spindle-like shape, while others are nearly oval in 
shape. In no cases have I been able to demonstrate the vermi- 
form bodies which were described by Dendy and others. Some- 
times the rhabdites appear almost homogeneous, and sometimes 
finely granular, but I have no doubt that they are all one and 
the same thing. In some sections the dorsal surface of the 
worm, outside the epidermic cells, is seen to be partly covered 
with a layer of hardened mucus which reveals a character quite 
similar to the rhabdites. They may possibly, by making the 
animal extremely unpalatable, serve as a protection for its own 
body, and also help to hold its prey more securely. 
Scattered in sparse numbers in the parenchyma are unicellular 
glands, which have the finely granular contents and open to the 
exterior at various points of the body-surface, as mentioned 
above. 
Besides those glands there are slime glands which occur 
deeply embedded in the parenchyma along the median plane of 
the body and open out on the surface of the sole. They occur 
in enormous quantities, and are distinguished from the glands 
opening out over the whole surface of the body by a closer 
affinity for borax carmine. In the terrestrial planarians the 
movements are effected by the action of cilia in mucus which is 
