^38 Comparative Animal Physiology 



the adhesiveness of the plasmalemma, the method of interconversion of gel 

 and sol, and the micellar state which gives contractile power to the gel. 



MOVEMENT IN GREGARINES 



Gregarines are parasitic in certain invertebrates, particularly in oligo- 

 chaetes and arthropods, and their trophozoites are motile. They have an outer 

 layer of myonemes or contractile fibrils, which cause movement of the body 

 in a variety of directions and are responsible for most of their locomotion. 

 In addition, the cells secrete a mucous film which has been said to have a 

 locomotor function. This film must favor attachment, but evidence that it 

 has a propulsive function is not convincing. 



REFERENCES 



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