58 



PROTOZOOLOGY 



the ventral surface. These lines are associated with rows of rosettes 

 from which bristles extend. These bristles are held to be sensory in 

 function and the network, a sensory conductor system, which is 

 connected with the neuromotor system. Turner maintains that the 

 neuromotor apparatus in Euplotes patella is augmented by a distinct 

 but connected external network of sensory fibrils. He however finds 

 no motorium in this protozoan. 



Lund (1933) also made a comparative study of the two systems 

 in Paramecium multimicronucleatum, and observed that the silverline 

 system of this ciliate consists of two parts. One portion is made up 



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

 a, ventral view; b, dorsal view. 



of a series of closely-set polygons, usually hexagons, but flattened 

 into rhomboids or other quadrilaterals in the regions of the cyto- 

 stome, cytopyge, and suture. This system of lines stains if the or- 

 ganisms are well dried. Usually the lines appear solid, but fre- 

 quently they are interrupted to appear double at the vertices of the 

 polygons which Klein called "indirectly connected" (pellicular) 

 conductile system. In the middle of the anterior and posterior sides 

 of the hexagons is found one granule or a cluster of 2-4 granules. 



