SPOLIA ZEYLANICA. 
88 
tint is green, in the other dull pink. In both there is a yellowish 
ground profusely marbled with light and dark shades of greenish or 
pinkish brown, and also with white. Besides this, yellow freckles 
are irregularly scattered here and there, and the whole dorsal surface 
is profusely sprinkled with white flattish tubercles of various sizes 
the largest being as much as 1 mm. in width. The sole of the foot 
and under-surface of the mantle are pinkish in one specimen, 
yellowish in the other, and in both bear numerous blotches of gray 
or olive. 
The foot is broad. Its anterior margin is deeply grooved and the 
upper lamina is notched in the middle, but the sides overlap so that 
the notch is hidden. Hence, probably, it was not noticed by Alder 
and Hancock. The tentacles are large, and have a hard core com¬ 
posed of spicules and granules, visible even externally through the 
transparent integuments. 
The pockets of the rhinophores are moderately raised and tuber- 
culate like the rest of the back. The branchial pocket is also a 
little raised, and has an undulated but not stellate margin. The 
branchiae are six, quadripinnate, and with stout stems. They are 
grayish, with darker speckles. The integuments are full of small 
spicules of various shapes, mostly bent in the middle, and with 
swollen ends. 
The inside of the body cavity is pinkish, and the same tint prevails 
in the intestines. The labial armature is very distinct, and consists 
of two triangular or hatchet-shaped plates composed of minute 
rods. The formula of the radula is about 45 X 75 , 0'75. The 
teeth are hamate and rather erect, especially the outermost, which 
are thinner than the others. The stomach lies outside the liver 
and near the exit of the intestine ; its interior bears numerous folds 
of a mossy appearance. The liver is pinkish in one specimen, 
yellowish in the other. In both specimens the intestine makes 
a bend under the liver mass on the right-hand side and comes 
up again. 
The blood glands are olive coloured, of moderate size, and entirely 
separated from one another by the central nervous system which 
lies between them. This latter is flat and coarsely granulate ; the 
separate ganglia are not distinguishable as preserved. 
The ampulla of the hermaphrodite gland is thick and coiled 
several times. The large distinct prostate shows two portions, one 
pink and one greenish. The vas deferens is not very long or much 
coiled. The lower part, where it passes into the prseputium and the 
prseputium itself, bear folds and knots, but no hard armature. The 
spermatotheca is large and green ; the spermatocyst small. 
I have compared these specimens with A. & H.’s text and figures, 
and also with the fragments of their original specimens of Disc . 
fragilis preserved ah Newcastle, and find that they belong to the same 
species, the only point of difference being that Alder and Hancock 
