LESS. IV 



GENERAL CHARACTERS 



posterior end, twisting to the right and left, and so on (Fig. 

 5, A D). These movements are so characteristic of the 

 genus that the name euglenoid is applied to them. 



C.VO.C 



c.vac 



FiG. 5. Euglena virtdis. 



A D, four views of the living organism, showing the changes of form 

 produced by the characteristic euglenoid movements. 



E, enlarged view, showing the nucleus (), reservoir of the con- 

 tactile vacuole (c. vac), with adjoining pigment spot, and gullet with a 

 single flagellum springing from it. 



F, enlarged view of the anterior end of E, showing pigment-spot 

 (pg) and reservoir (c. vac), mouth (///), gullet (<w), and origin of 

 flagellum (ft). 



G, resting form after binary fission, showing cyst or cell-wall (cy), 

 and the nuclei (mi) and reservoirs (c. vac) of the daughter-cells. 



ir, active form showing contractile vacuole (c. vac), reservoir (r), and 

 paramylum-bodies (/>). 



(A G, after Saville Kent : H, from Biitschli after Klebs. ) 



The body consists of protoplasm covered with a very 

 delicate skin or cuticle which is often finely striated, and 

 is to be looked upon as a superficial hardening of the 

 protoplasm. The green colour is due to the presence of 





