. Animal biology. Biology; Zoology; Physiology. Dorsal •Fin '???"\y4 Anterior ol mantla Eye- Arm Long arm. with suckers Ventral. Posterior .Edge of mantle -Siphon •Head -Aim. Fig. 50. — A, B, Octopus, at rest and in motion, f, siphon. C, Squid, side view. (From Hegner, after Merculiano and Williams.) pouches. Eventually as tiny clams, known as glochidia, they escape, settle on the bottom of the pond or river, and die unless a Fish rubs against them. In this event each glochidium becomes attached to the fish and as a parasite obtains free food and trans- portation for several weeks until i
. Animal biology. Biology; Zoology; Physiology. Dorsal •Fin '???"\y4 Anterior ol mantla Eye- Arm Long arm. with suckers Ventral. Posterior .Edge of mantle -Siphon •Head -Aim. Fig. 50. — A, B, Octopus, at rest and in motion, f, siphon. C, Squid, side view. (From Hegner, after Merculiano and Williams.) pouches. Eventually as tiny clams, known as glochidia, they escape, settle on the bottom of the pond or river, and die unless a Fish rubs against them. In this event each glochidium becomes attached to the fish and as a parasite obtains free food and trans- portation for several weeks until it has developed sufficiently to shift for itself. The economic importance of the Bivalves hardly need be men- tioned. Oyster-farms in America alone produce an annual crop valued at many millions of dollars. Fresh-water Mussels are the basis of the pearl button industry of the Mississippi Valley. And,. 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 Woodruff, Lorande Loss, 1879-1947. New York The Macmillan company
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