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University of California Publications in Zoology [Vol. 18 



The main longitudinal fibers were first seen and described in 

 Euplotes by Maupas (1883). He briefly described them as joining the 

 five anal cirri and extending forward, where they converge and join 

 into a single thread which ended in the cytoplasm of the anterior end 

 of the animal. As to their function he was unwilling to make any 

 suggestion. Three years before this discovery by Maupas, Englemann 

 (1880) had described a series of fibers in connection with the marginal 

 cirri of Stylonychia which extended from the cirri toward the middle 

 of the body. To these fibers Englemann gave the undoubted function 

 of being nervous. Prowazek (1903) found fibers in Euplotes liarpa 

 and Griffin (1910) found them in Euplotes worcesteri similar to those 

 described for Euplotes patella. Both of these authors ascribed to the 



cyt. mem. 



a. c. f. 



Fig. A. Eu/plotes patella. Ventral view showing principal organelles. Cirri 

 and membranelles indicated by basal granules only. X 725. Abbreviations: 

 a.c, anal cirri; a.c.f., anal cirri fibers; a.l., anterior lip; ant. cyt. f., anterior 

 cytostomal fiber; c.v., contractile vacuole; cyt., cytostome; cyt. mem., cytostomal 

 membranelles; cyt.r., cytostomal recess; f.c, frontal cirri; f.c.f., frontal cirri 

 fibers; mac, macronucleus; mb.f., membranelle fiber; m. c, marginal cirri; mic, 

 micronucleus; mot., motorium; ph., pharynx; s.a.l., sensory structure of lip; 

 V. c, ventral cirri. 



