5 . T H E PHYLUM PROTOZOA
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fourth of body ; single contractile vacuole near posterior body terminal ;
numerous food vacuoles in posterior half of body ; macroiiucleus large,
occupying most of anterior half of body; micronucleus, 2-5-3 p in
diameter, neat anterior body terminal, adjacent to macronucleus.
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FIGS. 80-85. Ancistrum spp. (80) A . cylidioides right view; (81) A. cylidioides left
view; (82) A . cylidioides ventral view; (83), A . subtruncatum right view; (84) A .
subtruncatum left view; (85) A . subtruncatum ventral view. CS, Cytostome; C V ,
contractile vacuole ; P V , food vacuole. (Redrawn after Issel, 1903.)
Other information.
division in A . cylidioides.
Issel has given a short account of nuclear