Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 152 SYSTEMATIC ZOOLOGY. causing malaria. Mosquitoes in biting a malarial patient take the parasite with the blood and can then infect FIG. 8.—Four stages in the history of the Sporozoan which causes malaria. In A a spore has just entered a blood-corpuscle; in B it has increased in size; in C it is beginning to break up into spores; in D the spores are fully formed. The blood-corpuscle now breaks up and the spores are set free to enter other corpuscles. another person. More recently di
Elements of comparative zoology (1904) Elements of comparative zoology elementsofcompar1904king Year: 1904 152 SYSTEMATIC ZOOLOGY. causing malaria. Mosquitoes in biting a malarial patient take the parasite with the blood and can then infect FIG. 8.—Four stages in the history of the Sporozoan which causes malaria. In A a spore has just entered a blood-corpuscle; in B it has increased in size; in C it is beginning to break up into spores; in D the spores are fully formed. The blood-corpuscle now breaks up and the spores are set free to enter other corpuscles. another person. More recently discovered is the Sporozoan which lives in the tissue-cells and is the cause of the disease smallpox. SUMMARY OF IMPORTANT FACTS. 1. The PROTOZOA are microscopic animals, each con- sisting of a single cell. 2. They may possess cell-organs as pseudopodia, cilia, flagella, cell-mouth, contracting vacuole. 3. Each cell performs all of the functions of life; there is no differentiation between the cells. 4. The Protozoa reproduced by division. Incomplete division may result in the formation of colonies. 5. The Protozoa are divided into Rhizopoda, Infusoria, and Sporozoa. 6. The RHIZOPODA have no external cuticle, and con- sequently may take food at any point of the surface. They possess pseudopodia. Many form skeletons of lime or silica. 7. The INFUSORIA have a cuticle; in most there is a cell-mouth for taking food. They have cilia, flagella, or tentacles.
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