MORPHOLOGY 



77 



mentous connection between the spherules and the wall of the 

 vesicle. Penard maintains that these bodies are balancing cell-organs 

 and called the vesicle, the statocyst, and the spherules, the stato- 

 liths. 



Another vacuole, known as concrement vacuole, is a character- 

 istic organella in Biitschliidae and Paraisotrichidae. As a rule, there 

 is a single vacuole present in an individual in the anterior third of 

 body. It is spherical to oval and its structure appears to be highly 

 complex. According to Dogiel, the vacuole is composed of a pellicu- 

 lar cap, a permanent vacuolar wall, concrement grains and two 



Fig. 30.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. 



fibrillar systems (Fig. 30, 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 

 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 



