DORIDOEIDES GARDINERI. 281 
was evidently much wider in life as the margins are bent and 
rolled up. The free part of the mantle starting from its 
junction with the foot is 3°5 wide. It can be seen from the 
outside that about 2°5 mm. of this space are filled with dark 
internal organs and that only about 1 mm. of it corresponds 
to the mantle margin generally found in Dorids. The genital 
orifice is about 4 mm. from the anterior end, and the anus is 
about 2 mm. behind it. 
The animals are of a greyish-green colour, a little darke1 
in the centre where the internal organs show through, and 
lighter at the edges'where there are none. Practically the 
coloration is uniform, though some specimens are lighter than 
others and the under side is usually rather lighter than the 
upper. 
To the naked eye the dorsal surface appears to be smooth, 
but under a low power can be seen to be covered with small 
warts of various sizes, sometimes connected by an irregular 
reticulation and with minute pits between them. There is no 
median ridge and no trace of a branchial opening. ‘The 
integuments are devoid of spines. The dorsal epidermis is 
thick and consists of several layers of cells: it is profusely 
pitted with mucus glands (fig. 2,6) and in many places rises 
into folds (fig. 2, a). On the under surface of the mantle and 
on the foot the epidermis is thin, but the foot is highly glandu- 
lar. It contains both epidermal glands and subepidermal 
elands with granular contents and communicating with the 
exterior by long necks. 
The rhinophores are completely retractile. Their pockets 
are simple holes without sheaths, visible to the naked eye ; but 
in the sections it can be seen that the margins are slightly 
raised. As preserved, the pockets are often closed. When 
retracted the rhinophores often exhibit a few (6—7) strong 
transverse wrinkles or furrows, and these were also present in 
the specimen obtained at Rotuma. But they are probably 
not real perfoliations since they are absent when the rhino- 
phores are completely exserted. In such cases the outline is 
even and cylindrical. There are no oral tentacles and nothing 
