84 



PLANT-ANIMALS 



[CH. 



life of the animal, they are not called upon to cater 

 for all the food that it requires. 



As a first step toward the investigation of their 

 origin and rdle, we will make a microscopic examina- 

 tion of the coloured cells of our plant-animals. 



--YB 



Fig. 16. A larval Convoluta paradoxa showing cilia and bristle-like 



projections from skin. YB = the only yellow-brown cell contained 



in the body. M= mouth and gullet. OC = eye spots. OT = otocyst. 



The tissue of the body is crowded with large numbers of 



diatoms which have been ingested. 



When a living C. roscofFensis is examined under 

 the low power of the microscope, its green cells are 

 seen to be, some spherical, some pear-shaped and 



