. Elementary lessons in zoölogy : a guide in studying animal life and structure in field and laboratory . DiAGRAM OF Unio: u, umbo; h, hinge; s, siphons; small arrows indicate the direction of the water currents; large arrow indicates direction of travel, and also depth to which the animal is usually found buried in the sand in locomotion; /, foot; e, edge of the valves; I, concentric lines of growth; m, mantle margins extruded in front. face, at both anterior and posterior ends: it encounters the strong muscles which hold the valves together. Cut these off close to the valve. Notice the valve
. Elementary lessons in zoölogy : a guide in studying animal life and structure in field and laboratory . DiAGRAM OF Unio: u, umbo; h, hinge; s, siphons; small arrows indicate the direction of the water currents; large arrow indicates direction of travel, and also depth to which the animal is usually found buried in the sand in locomotion; /, foot; e, edge of the valves; I, concentric lines of growth; m, mantle margins extruded in front. face, at both anterior and posterior ends: it encounters the strong muscles which hold the valves together. Cut these off close to the valve. Notice the valves spring apart when these are severed. Free the one valve from all connection with mantle and muscles, and turn it back like the lid of a watch case. I. The Different Parts. — Study the following parts, doing no more dissecting than is absolutely necessary: — 1. The mantle. Observe the thinness and transpar-
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1896
