MITOCHONDRIA 



protozoan cells contain mitochondria, but while the majority 

 of workers who have looked for a Golgi apparatus in Protozoa 



Fig. 392. — Drawing by Dr. H. B. Fell of a living fibroblast under dark-ground 

 illumination. The nuclear membrane, two nucleoli, filamentous mitochondria, 

 and fat globules are shown, x c. tooo. — From Le Gros Clark, The Tissues of 

 the Body, 3rd edition, 1952. Clarendon Press, Oxford. 



have found something to which they have given the name, they 

 have not been able to agree on what most deserves to be so called. 



CILIA AND FLAGELLA 



As we have seen in the chapters on the Protozoa, these animals 

 have many specialisations of the cytoplasm, such as pseudo- 

 podia, cilia, myonemes and axial fibres. Metazoan cells, as fits 

 their greater specialisation, have fewer of these, although, as 

 is described below, individual cells may have one specialisation, 

 especially pseudopodia or cilia, strongly developed. Cilia and 

 fiagella are especially interesting, because it appears from studies 

 made with the electron microscope that those of green Algae, of 



