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PROTOZOOLOGY 



complex. According to Dogiel (1929), the vacuole is composed of a 

 pellicular cap, a permanent vacuolar wall, concrement grains and 

 two fibrillar systems (Fig. 31, d). When the organism divides, the an- 

 terior daughter individual retains it, and the posterior individual de- 

 velopes a new one from the pellicle into which concrement grains 



Fig. 31. a-c, Miiller's vesicles in Loxodes (a, b) and in Remanella (c) 

 (a, Penard; b, c, Kahl); d, concrement vacuole of Blepharoprosthium 

 (Dogiel). cf, centripetal fibril; eg, concrement grains; cp, cap; fw, fibrils 

 of wall; p, pellicle; vp, vacuolar pore; w, wall. 



enter after first appearing in the endoplasm. This vacuole shows no 

 external pore. Dogiel believes that its function is sensory and has 

 named the vacuole, the statocyst, and the enclosed grains, the 

 statoliths. 



Food vacuoles are conspicuously present in the holozoic Protozoa 

 which take in whole or parts of other organisms as food. The food 

 vacuole is a space in the cytoplasm, containing the fluid medium 

 which surrounds the protozoans and in which are suspended the 

 food matter, such as various Protophyta, other Protozoa or small 

 Metazoa. In the Sarcodina and the Mastigophora which do not 

 possess a cytostome, the food vacuoles assume the shape of the food 

 materials and, when these particles are large, it is difficult to make 

 out the thin film of water which surrounds them. When minute food 



