. Elementary biology, animal and human. Biology. FISHES 137 rather than as organs of hearing. Fishes from which these internal ears have been removed are unable to maintain their equiUbrium. Some fishes have special organs that serve as tactile organs such as are found on the under side of the head of a cod (Fig. 108) and also on the head of bullheads (Fig. 101). Along each side of the body and tail of fishes is a series of little openings or pores which form what is known as the lateral line (Fig. 108). These organs are supposed to be principally organs of Fig. 101. —BuUhead. (Goode.)
. Elementary biology, animal and human. Biology. FISHES 137 rather than as organs of hearing. Fishes from which these internal ears have been removed are unable to maintain their equiUbrium. Some fishes have special organs that serve as tactile organs such as are found on the under side of the head of a cod (Fig. 108) and also on the head of bullheads (Fig. 101). Along each side of the body and tail of fishes is a series of little openings or pores which form what is known as the lateral line (Fig. 108). These organs are supposed to be principally organs of Fig. 101. —BuUhead. (Goode.) 104. Reproduction and life history. — The flowers of seed plants are devoted to the production of seeds which, in turn, produce new plants of the same kind (P. B., 83). Likewise in fishes there are special organs the sole function of which is the production of new individuals. The organs of fishes which may be said to correspond in function to the stamens and pistils of flowers are the ovaries (Fig. 98) and spermaries. In the ovaries are produced many egg-cells, and the mass of eggs in the ovary of a fish is often called the roe. In order that an egg may develop it must first be fer- tilized by a sperm-cell from the spermary of a male fish. This process usually occurs in the water after the ripe eggs and sperm-cells have been extruded from the ovaries and sper- maries of the parent fishes. You will recall the fact that the pollen tube containing a sperm-nucleus makes' its way into an ovule and that the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Peabody, James Edward, b. 1869; Hunt, Arthur Ellsworth, joint author. New York, The Macmillan company
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