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 role, we will make a microscopic examina- 

 tion of the coloured cells of our plant-animals. 



Fig. 16. A larval Convoluta paradoxa magnified 60 times showing 

 cilia and bristle-like projections from skin. Y B = 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 iugested. 



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 



