. Beginners' Zoology . r the drawings write thenames of the margins of the shell (p. 98) and of other partslearned, using lines to indicate the location of the parts. Study the surface of the shell inside and out. Theinside is called mother-of-pearl. Is it of Is thedeeper layer of the shell of lime. (When weak hydro-chloric acid or strong vinegar is dropped on limy substances,-a gas, carbon dioxide, bubbles up.) Compare the thicknessof the epidermal layer, the middle chalky layer, and theinner, pearly layer. Anatomy of the Mussel. — What parts protrude at anytime beyond the edge of the
. Beginners' Zoology . r the drawings write thenames of the margins of the shell (p. 98) and of other partslearned, using lines to indicate the location of the parts. Study the surface of the shell inside and out. Theinside is called mother-of-pearl. Is it of Is thedeeper layer of the shell of lime. (When weak hydro-chloric acid or strong vinegar is dropped on limy substances,-a gas, carbon dioxide, bubbles up.) Compare the thicknessof the epidermal layer, the middle chalky layer, and theinner, pearly layer. Anatomy of the Mussel. — What parts protrude at anytime beyond the edge of the shell 1 (Fig. 190.) The shellis secreted by two folds of the outerlayer of the soft body of the mus-sel. These large, flaplike folds hangdown on each side, and are calledthe mantle. The two great flapsof the mantle hang down lower thanthe rest of the body and line theshell which it secretes (Fig. 192).ffhe epidermis of the mantle secretes the shell just as theepidermis of the crayfish secretes its crust. Can you find. fiG. 191. — of points of attach-ment of muscles as musselenlarges. (Morgan.) lOO BEGINNERS ZOOLOGY
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