. The cell; outlines of general anatomy and physiology. Cells; Anatomy; Physiology; Cells; Anatomy; Physiology. 290 THE CELL into a bundle of from sixteen to thirty-two spermatozoids (Fig. 158 M^). Thej are "extended bodies, bearing anteriorly two cilia, the original green colour of which has been transformed into ; The individual bundles separate from the mother-colony, and swim about in the water. " If they meet a female colony, the cilia on both sides become entangled; by this means the male colony is fixed; it however soon falls to pieces, after which the individual s
. The cell; outlines of general anatomy and physiology. Cells; Anatomy; Physiology; Cells; Anatomy; Physiology. 290 THE CELL into a bundle of from sixteen to thirty-two spermatozoids (Fig. 158 M^). Thej are "extended bodies, bearing anteriorly two cilia, the original green colour of which has been transformed into ; The individual bundles separate from the mother-colony, and swim about in the water. " If they meet a female colony, the cilia on both sides become entangled; by this means the male colony is fixed; it however soon falls to pieces, after which the individual spermatozoids, which become considerably longer, bore their way into the gelatinous vesicle of the female colony. They then their way to the egg-cells, to which, after they have crept round them, they attach themselves, often in great numbers. We may assume that, as has been observed in many other cases, one of these spermatozoids makes its way into each egg-cell " (Sachs),. Fig. 159,—Volvox glohator, sexual, hermaphrodite colony, somewhat repre- sentation constructed from figures by Cienkovsky and Biitschli (after Lang, Fig. 21): s male gamete (spermatozoid); 0 female gametes (eggs). Finally, in Volvox glohator (Fig. 159) the differentiation is greater than ever, for amongst the very numerous cells which constitute the globular colony some remain vegetative, whilst others become transformed into sexual cells. Further the eggs (0) are still larger than in Eudorma, and are fertilised by very small male elements (s), which swim about with two flagella. If we take all these numerous facts into account, we may snicely consider the following law as established, that egg and sperm- cells are derived from reproductive cells, which, to start with, are similar and not to be distinguished from one another, but which become differentiated by developing in opposite directions. II. The Physiology of the Process of Fertilisation. Having discussed the morphologi
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