78 



BIOLOGY OF THE PROTOZOA 



In Metazoa the Golgi apparatus appears under two main aspects, 

 one diffused, the other localized. These may be converted one into 

 the other in different stages of cell activity and they should be 

 regarded as variations of the same substance in the cell or of the 

 same structural element. The localized phase was termed by Golgi 

 (1898) the "internal reticular apparatus" from the characteristic 

 net-like structure which it assumes in nerve cells. The granular 

 phase is derived, apparently, from the fragmentation of the fibrils 

 which make up the net structure. 



In Protozoa the Golgi apparatus rarely appears in the form of a 

 network, although aggregates of lipoprotein^ which are found in 

 some cases are regarded as the equivalent of the localized phase 

 typical of metazoan cells. The granular phase, however, is widely 

 distributed in the form of spherules which are larger in size than 



Fig. 



39. — Golgi apparatus in Amoeba proteus. (After Brown, Biological Bulletin, 

 courtesy of the Marine Biological Laboratory.) 



mitochondria and have an osmium blackening lipoidal cortex (osmi- 

 ophilic portion) and a gray-staining medullary part (osmiophobic 

 portion). This gives them the appearance of black rings or, if 

 imperfectly stained, of crescents or even of rods. In the latter 

 condition they are easily mistaken for mitochondria (Fig. 39). 



Golgi bodies as distinct from mitochondria, were first recorded 

 by Hirschler (1914) in Monocystis ascidiae a gregarine and similar 

 parasitic forms seem to have been the favorite material for their 

 study. King and Gatenby (1923) and Joyet-Lavergne (1923) 

 described them again in Sporozoa. Since this time, however, descrip- 

 tions of Golgi bodies from many forms, including representatives 

 from all groups of Protozoa, have been published and various 

 attempts have been made to attach some specific function in the 

 cell to them. 



Following the course of development of the subject in Metazoa, 



