86 
SPOLIA ZEYLANICA. 
Trippa areolata (A. & H.). 
A. & H. I., p. 119, cf. Doris spongiosa , KelaartL, p. 302. 
Phlegmodoris mephitica , Bergh, in Semper’s Reisen Heft 13, p. 594. 
One specimen, which must have been about 90 mm. long when 
perfect. The whole mantle margin has been detached, apparently 
by autotomy, as often happens in Discodoris fragilis, but has been 
preserved with the rest of the animal. The colour is now a yellowish 
green of various shades, diversified by circles or pits of a deep black. 
Dr. Willey has kindly given me some notes and a diagram illustrating 
the appearance of the hying animal. It was of a “ brownish bath 
sponge ground colour,” with a peaked median ridge. At the sides 
were rows of “ black areolae with yellowish borders, increasing the 
appearance of depth.” The row next to the ridge consists of ten 
relatively small areolae. In the next row are nine, of which six are 
large, twice the size of any of the others. Nearer the margin are 
three rows of small areolae. “ The whole dorsum [is beset] with 
upstanding peaks between the areolae.” 
The general structure of the dorsal surface is as in T. intecta (Kel.) 
already described, the chief difference being that the tubercles are 
united into ridges arranged in a more regular pattern, and divided 
in places by the black depressed areas mentioned above. There is a 
medio-dorsal ridge, composed of compound tubercles fused together, 
which gives off lateral ridges. These again send off other ridges and 
thus connect with one another. Near both the head and tail the 
ridges become so numerous and complicated that no pattern can 
be distinguished. The appearance of the preserved specimen does 
not quite agree with the diagram, evidently because the tubercles 
contract in alcohol and hide the smaller areolae between them. 
There are four black areolae symmetrically arranged at the sides of the 
median ridge, and other less distinct areolae of the same kind nearer 
the mantle margin. These spaces are smooth, but the tuberculate 
part of the back is thickly covered with little spiculous cylindrical 
processes. Hence the animal, though flabby, is yet rather harsh 
and rough to the touch. 
The rhinophore sheaths are high, tuberculate, and with jagged 
margins. The branchiae are 5 : three are much larger than the 
others and have a very wide main rhachis. The inner side is whitish. 
The edge of the pocket shows five very irregular undulations. The 
front of the foot is split, and the upper lamina runs up to the mouth 
on either side. At the point of junction is a fairly large oral 
tentacle. 
As in T . intecta , there is a ring of ptyaline glands round the 
mouth tube. 
There is no trace of jaws. The radula is conspicuous and composed 
of large teeth, but its dimensions as a whole are not large. The 
formula is about 25 X 40 *0*40 as a maximum. The teeth are 
