Elements of biology, with special Elements of biology, with special reference to their rôle in the lives of animals elementsofbiolog00buch Year: 1933 UNICELLULAR FORMS 89 Organization. In several ways volvox anticipates the organi- zation attained by the multicellahir animals. In the first place, the whole colony is correlated in such fashion that the flagellcT beat syn- chronously, thus imparting an orderly motion to the colony. Sec- ondly, there is a certain division of eflfort on the part of the various PROTOPLASMIC BRIDGE EGG SPERMATOZOA DEVELOPING COLONIES FLAGELLUM â MATRIX Fig. 27.
Elements of biology, with special Elements of biology, with special reference to their rôle in the lives of animals elementsofbiolog00buch Year: 1933 UNICELLULAR FORMS 89 Organization. In several ways volvox anticipates the organi- zation attained by the multicellahir animals. In the first place, the whole colony is correlated in such fashion that the flagellcT beat syn- chronously, thus imparting an orderly motion to the colony. Sec- ondly, there is a certain division of eflfort on the part of the various PROTOPLASMIC BRIDGE EGG SPERMATOZOA DEVELOPING COLONIES FLAGELLUM â MATRIX Fig. 27.âMature volvox colony. (After Janet, modified.) members of the colony, a forerunner of the very great differences in function between the various types of cells found in multicellular animals. This division of labor in volvox is limited to the setting aside of certain members of the colony as reproductive cells. Thus the members of the colony do not reproduce singly, but rather the colony reproduces itself. Reproduction. Two types of reproductive processes occur. In the more simple, asexual type, a single cell, a parthenogonidium, is intruded into the central cavity of the colony, which by cell
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