128 



BIOLOGY OF THE PROTOZOA 



environment. These may be grouped as cortical differentiations 

 for (o) support and protection; (h) locomotion and irritability; 

 and (c) food-getting and defecation. 



Fig 65 —.4, B, C, Form, structure of plates, and division of Coleps hirtus^ (after 

 Maupas); .D, 'chloropdtis sp. (Original); E, Phacus longicaudus (after Stein) ; F, 

 Menoidium inmrvum. (after Hall.) 



(a) Cortical Differentiations for Support and Protection. -Apart 

 from the thickening and hardening of the periplast which furnishes 

 sufficient protection and support for the great majority of flagellates 



