PROTOZOA 



73 



Fig. 39— GIARDIA MURIS 



A type of intestinal parasite common in man 

 and mammals; a complicated system of kinetic 

 elements in the form of granules and fibers. 

 ax, axostyle; b, blepliaroplast; bg, basal body; 

 k, endosome; p, parabasal body; nuc, nucleus 



After Kofoid and Swezy 

 Magnification, 2100 



(Fig. 40) is raised up about the 

 base of the flagellum, thus giv- 

 ing rise to cells of the same 

 character as the choanocytes, 



or collared cells, which make up a large part of the tissues of 



sponges. 



Flagella are highly variable in size and in number. In the 



simpler forms one is the rule, but forms with two, three, four, 



Fig. 40— AN ARBOROID 



COLONY CALLED 



CODONOSIGA 



CYMOSA 



Each individual bears a coni- 

 cal collar about the flagellum. 

 Similar collar-bearing cells 

 make up a large part of the 

 structure of sponges 



After Kent 

 Magnification, 400 



six, eight, and many flagella are common. If two are present 

 they may be of the same size, e.g., Amphimonads, or of different 

 sizes, e.g., Monads and Bodos; one may be directed to the front 



