150 LIVERPOOL BIOLOGICAL SOCIETY. 



in various ways. In Dofo (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 EoUs (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 Eolis (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 expernnents 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 7^ feet long, SJ 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- 

 iilas jj/iolis, 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 vabjarU) and plaice 



* See Herdman, Opening Address, in Trans. BioL Soc, Liverpool, vol. iv., 

 p. It) ; and Quart. Journ. Microsc. Sci., vol. xxxi., p. 41, April, 1890. 



