. Beginners' Zoology . Fig. 202.— A Snail. io6 BEGINNERS ZOOLOGY. out as they are extended? Is the respiratory opening on theright or the left side of the body? On the mantle fold Or on the body? (Figs. 202-3-4.) How =$=fe«sf^?v*^3Hfewerf7 often does the aperture ^*^^^^^^^^^^^=** open and close ? Place the snail in aFig. 203. — A Slug. ^ ^ , , ^ moist tumbler. Does the whole under surface seem to be used in creeping? Does thecreeping surface change shape as the snail creeps ? Do any foldsor wrinkles seem tomove either toward thefront or the rear of itsbody? Is enough mu-cus left to mark thepat
. Beginners' Zoology . Fig. 202.— A Snail. io6 BEGINNERS ZOOLOGY. out as they are extended? Is the respiratory opening on theright or the left side of the body? On the mantle fold Or on the body? (Figs. 202-3-4.) How =$=fe«sf^?v*^3Hfewerf7 often does the aperture ^*^^^^^^^^^^^=** open and close ? Place the snail in aFig. 203. — A Slug. ^ ^ , , ^ moist tumbler. Does the whole under surface seem to be used in creeping? Does thecreeping surface change shape as the snail creeps ? Do any foldsor wrinkles seem tomove either toward thefront or the rear of itsbody? Is enough mu-cus left to mark thepath travelled? Thefold moves to the front,adheres, and smoothsout as the slug or snailis pulled forward. Cephalopods. — Thehighest and best de-veloped molluscs are
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