MORPHOLOGY 



57 



Fig. 18. The silverline system of Ancistruma mytili, XlOOO (Kidder), 

 a, ventral view; b, dorsal view. 



A striking feature common to all neuromotor systems, is that 

 there seems to be a central motorium from which radiate fibers 

 to different ciliary structures and that, at the bases of such motor 

 organellae, are found the basal granules or plates to which the 

 "nerve" fibers from the motorium are attached. 



Independent of the studies on the neuromotor system of 

 American investigators, Klein (1926) introduced the silver-im- 

 pregnation method which had first been used by Golgi in 1873 

 to demonstrate various fibrillar structures of metazoan cells, to 

 Protozoa in order to demonstrate the cortical fibers present in 

 ciliates, by dry-fixation and impregnating with silver nitrate. 

 K,lein (1926-1930) subjected the ciliates of numerous genera and 

 species to this method, and observed that there was a fibrillar 

 system in the ectoplasm at the level of the basal granules which 

 cannot be demonstrated by other methods. Ivlein (1927) named 

 the fibers silver lines and the whole complex, the silverline sys- 

 tem, which is characteristic of each species (Fig. 18). Chatton 



