MORPHOLOGY 



(17 



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 

 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- 



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

 a, ventral view; b, dorsal view. 



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, 

 which marks the outer end of the trichocyst. The second part which 

 Klein called "directly connected" (subpellicular) conductile system 

 consists essentially of the longitudinal lines connecting all kine- 

 tosomes in a longitudinal row of hexagons and of delicate transverse 

 fibrils connecting granules of adjacent rows especially in the cyto- 

 stomal region (Fig. 19). 



By using Sharp's technique, Lund found the neuromotor system 



