An introduction to the study of the comparative anatomy of animals . e protoplasm, and its consistence, admit-ting of no pseudopodial movement, confers a more or lessdefinite shape on the body; a shape, however, which alterssomewhat as a result of the contractility of the cortex. Thiscontractility is manifested as a constriction appearing at oneend of the body, and travelling slowly to the other, givingrise to frequent changes of form. These sluggish move-ments are termed euglenoid, because they are highly char-acteristic of the green animalcule Euglena, which will bedescribed in the next chap
An introduction to the study of the comparative anatomy of animals . e protoplasm, and its consistence, admit-ting of no pseudopodial movement, confers a more or lessdefinite shape on the body; a shape, however, which alterssomewhat as a result of the contractility of the cortex. Thiscontractility is manifested as a constriction appearing at oneend of the body, and travelling slowly to the other, givingrise to frequent changes of form. These sluggish move-ments are termed euglenoid, because they are highly char-acteristic of the green animalcule Euglena, which will bedescribed in the next chapter. The Gregarines are probablydegenerate in consequence of their parasitic habit, andaccordingly we find that Monocystis has no pseudopodia,no flagella or cilia, and no contractile vacuole. After moving 154Digitized by Microsoft® MdNOCYSTIS 15s about for a short time in the worms -sperm-sacs, the freeand mature Monocystis conjugates and encysts. Twoindividuals come together, and are attached to one anotherby their broader ends. In this condition each individual. A
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