118 SPOLIA ZEYLANICA. 
No particular mention need be made of the epithelial layer of the 
sole, except to point out that the epithelium is composed of a single 
layer of cubical ciliated cells, which are interrupted by numerous 
erythrophile and cyanophile glands. The ‘“‘Stabchen” never 
occur in this region, though a very few rhammites are often found 
in that part of the epithelium which passes over from the sole 
to the inner ridge of the ciliated organ (Plate IV., fig. 10, rm). 
I have carefully examined the sections of the sole to ascertain 
if there were any sinking of the sole-epithelial cells into the 
parenchyme, as von Graff has observed in many species of the 
genus Rhynchodemus. But I have not recognized this phenomenon 
in a single case. This fact and the presence of the well-developed 
marginal glands must be regarded as evidence against the direct 
relationship of the present form to the genus Rhynchodemus. 
The structure of two eyes is essentially the same as described 
and figured by von Graff* in Platydemus grandis, Spencer. The 
only point of difference is that the vitreous body filling the interior 
of the eye-camera is represented in the present case by a homo- 
geneous substance perforated by many irregular clear spaces ; 
consequently there is no indication of any trace of the prismatic 
structures, which are, according to von Graff, always present in the 
so-called ** Retina-Augen.” But I fear that the deviation shown 
in the present instance is not actual, but is probably due to the 
improper fixation of the eye tissues. 
As mentioned above, the longitudinal parenchyme muscles (see 
Plate IV., fig. 7, lpm) are, as in all genera of the Rhynchodemide, 
except Dolichoplana, developed all round in the parenchyme as a 
thick and continuous sheet surrounding the gut and the central 
nerve cords. 
The two ovaries are situated about 3°5 mm. from the head end. 
They give rise to two slender oviducts, which run straight backwards 
along the dorso-lateral side of the two nerve cords. The testes are 
numerous, roughly 50 to 60 on each side, and are arranged generally 
in two irregular alternate rows. Their anterior extremities are 
about 0°5 mm. behind the ovaries, and they extend posteriorly as 
far asthe mouth. The two vasa deferentia run posteriorly along the 
inner side of the oviducts. Tregretthat owing to my careless manipu- 
lation while cutting the body with the scissors the connection of the 
common duct of the vasa deferentia with the penis was destroyed. 
Consequently I have not been able to determine how the common 
male duct enters into the penis, and how the latter opens to the male 
atrium. In the attached semi-diagrammatic figure representing 
the copulatory organs the broken parts are indicated by dotted 
lines. At the level of the common genital opening (go) the male 
atrium (ma) communicates with the underlying female atrium (fa), 


* Von Graff, op. cit., p. 144, figs. 1 and 2, in Taf. L. 
