PROTOZOA AND OTHER ANIMALS 



931 



Figure 197. Fixation mechanisms in peritrichs. A, Ellobiophrya donacis, with ring 

 formed by two posterior limbs applied at the ends ; B, Ellobiophrya suspended from the 

 bridges uniting the gill filaments of Donax vittatus ; C, section of Trichodina pedtculus 

 on the ectoderm of Hydra; D, Cyclochaeta {Urceolaria) korschelti from Chiton rnar- 

 ginatus. (A, B, after Chatton and Lwoff, 1929; C, D, after Zick, 1928.) 



Cleveland, 1935). Giardia adheres by a sucking disc to the wall of the 

 small intestine. 



In some ectoparasitic dinoflagellates, the organelle of fixation is pro- 

 longed by rhizoids into the tissues of the host, and apparently nutriment 

 is absorbed by this mechanism. In the polymastigotes in termites, fixation 

 is only to the gut intima; there is no relationship to the epithelial cells. 



