MORPHOLOGY 



81 



like or filamentous bodies, and show a tendency to adhere to or re- 

 main near protoplasmic surfaces. In many cases they are distributed 

 without any definite order; in others, as in Paramecium or Opalina, 

 they are regularly arranged between the kinetosomes of cilia (Hor- 

 ning). In Tillina canalifera, Turner (1940) noticed that the endo- 

 plasmic chondriosomes are evenly distributed throughout the cyto- 

 plasm (Fig. 26, b), while the ectoplasmic chondriosomes are ar- 











Sic. < x 



v } r 





a 



b m^' 



Fig. 26. Chondriosomes in Tillina canalifera (Turner), a, diagram show- 

 ing the ectoplasmic chondriosomes (c, cilium; cf, coordinating fibril; ch, 

 chondriosome; cr, ciliary rootlet; k, kinetosome I and II; p, pellicle); b, a 

 section showing chondriosomes and food vacuoles. 



ranged in regular cross rows, one in the center of each square formed 

 by four cilia (Fig. 2f6, a). In Peranema trichophorum, Hall (1929) ob- 

 served peripheral chondriosomes located along the spiral striae, 

 which Chadefaud (1938) considered as mucus bodies. Weisz (1949, 

 1950) finds that stentorin and zoopurpurin already mentioned (p. 

 45) are chondriosomes. 



In certain Protozoa, the chondriosomes are not always demon- 

 strable. For example, Horning states in Monocystis the chondrio- 

 somes present throughout the asexual life-cycle as rod-shaped bodies, 

 but at the beginning of the spore formation they decrease in size and 

 number, and in the spore none exists. The chondriosomes appear as 

 soon as the sporozoites are set free. Thus it would appear that the 



