1388 TOKIO KABURAKI 
peripharyngeal chamber. In some preserved specimens, it was 
protruded through the mouth-opening as a cylindrical organ of 
a creamy or white colour. 
The common genital aperture is situated about half-way be- 
tween the mouth-opening and the posterior extremity of the 
body. 
Kpidermis.—The specimens had not been preserved in 
a condition satisfactory for the purpose of mimute examination. 
The epidermis is not of the same thickness all over the body, 
bemg thickest on the dorsal surface, gradually becoming thinner 
as it passes round to the mid-ventral surface. The cilia, though 
stated by some investigators to exist over the entire surface of 
the body, in this species are present on the surface of the sole 
only. Dorsally and laterally the epidermis, as is well known, is 
made up of closely packed, elongated, columnar cells resting 
upon a basement membrane, each with an oval nucleus at its 
base. Apparently wedged in between these cells, except those 
that are on the head-surface, are found spindle-shaped bodies, 
the rhabdites, which originate from their mother-cells, scattered 
in fair abundance in the parenchyma beneath the dermal 
musculature. In some cases the rhabdites are seen to be in 
connexion with their mother-cells. Also there are some unicellu- 
lar glands which open to the exterior here and there. Between 
the epidermal cells are found some ‘ gland cells ’ with granular 
contents. These, though having been regarded by Dendy (9) 
as masses of hardened mucus originating from the rhabdite- 
forming cells, appear to me to be masses of mucus derived from 
the glandular cells. Except on the surface of the sole the 
epidermis on the ventral surface is constructed in the same 
manner as that on the dorsal. Embedded in the parenchyma 
are unicellular glands, which are much more abundant on the 
ventral than on the dorsal surface, and these make thei way 
to the surface generally, instead of opening on the ventral 
surface, more especially submarginally, as they do in some 
other terrestrial forms as well as in all the freshwater and 
marie Triclads. The epidermis on the surface of the sole, as 
has been already indicated, is composed of closely packed, 
