150 LIVERPOOL BIOLOGICAL SOCIETY. 
in various ways. In Doto (fig. 15) there is a single row of 
cerata on each side of the body, but each member of the 
row is lobed. In most species of Molis (fig. 16) there are 
several rows of cerata on each side, or in other words each 
of the lobed cerata of Doto is represented by a group of 
simple cerata in Molis (see Pl. VI. figs. 15 and 16). 
Consequently we think there are grounds for considering 
all these dorso-lateral projections, whether they be ridges 
or parieto-cerata or hepato-cerata, simple or branched, as 
being epipodial in their nature. 
Part III. EXPERIMENTS WITH FISHES. 
With the view of testing the theory that the remarkable 
shapes and colours of Nudibranchs are either of a pro- 
tective or of a warning nature,* and are definitely related 
to their edibility or the reverse, we arranged some experi- 
ments on the feeding of Fishes with Nudibranchs, which 
were carried out in the Aquarium of the Liverpool Free 
Public Museum, with the kind co-operation of the Curator, 
Mr. T. J. Moore, and some of his assistants. 
Most of the experiments were made in three large fish 
tanks, which may be called A, B, and C. A and B are rec- 
tangular slate and plate-glass wall-tanks lit from the top, 
measuring 73 feet long, 54 feet wide, and 3} feet high, 
and containing each about 700 gallons of sea water and 
some rock-work. A has a gravel bottom, and contains 
about twenty very healthy and active adult shannies (Blen- 
nius pholis, obtained from the Menai Straits); while B 
has a sandy floor and is devoted to flat fish—it contains 
a considerable number of soles (Solea vulgaris) and plaice 
* See Herdman, Opening Address, in Trans. Biol. Soc., Liverpool, vol. iy., 
p- 16; and Quart. Journ. Microsc. Sci., vol. xxxi., p. 41, April, 1890. 
