HORN ELL— THE PRESENCE OF SYMBIOTIC ALG^ IN MELIBE 



147 



apparently algal, were quantities of clear, ronndecl, colourless cells filled with 

 refractive granules (Figs. 4 and 4a). 



The above notes were made during a rough examination of the living tissue. 

 As I was greatly pressed for time, they are necessarily superficial ; time and opportunity 

 to carry the inquiry further have both been lacking. 



For some time I was unable to satisfy myself as to the nature of the organism. 

 As the handful of its separate masses was all in one diver's bag, I inferred that 

 they had been grouped together when torn from their attachment by the diver, their 

 sessile manner of growth being shown by the small discous scar which each bore. 

 The apparently symbiotic conjunction of animal and plant (algal) tissues ])uzzlcd me, 

 as did the lack of any indication of alimentary or other canal. Later, I was able to 

 identify the masses as cerata from the dorsum of a large Nudibranch of the genus 

 Melibe, the M. rangii of Bergh. 



ii 



