Animal life in the sea and on the land . Fig. 58.—Acorn-barnacle, with Arms ex TENDED. BARNACLES. 101. Fig. 59.— Body op GOOSE-JBAUNACLE. crabs, but as they grow older they attach themselves torocks, shells, drift-wood, sea-weed, sponges, turtles, or evento jelly-fishes. The head is firmly glued to these objectsby a cement which the animal secretes. The rest of thebody is free, and can be extended be-yond the shell. Fig. 59 shows the bodyof a barnacle as it looks within the shell. 8. While young, and frolicking aboutin the water, barnacles have two well-developed eyes, but these dwindle awaywh
Animal life in the sea and on the land . Fig. 58.—Acorn-barnacle, with Arms ex TENDED. BARNACLES. 101. Fig. 59.— Body op GOOSE-JBAUNACLE. crabs, but as they grow older they attach themselves torocks, shells, drift-wood, sea-weed, sponges, turtles, or evento jelly-fishes. The head is firmly glued to these objectsby a cement which the animal secretes. The rest of thebody is free, and can be extended be-yond the shell. Fig. 59 shows the bodyof a barnacle as it looks within the shell. 8. While young, and frolicking aboutin the water, barnacles have two well-developed eyes, but these dwindle awaywhen the animal settles for life, and theyfinally disappear altogether. The shellycovering now grows, and henceforth bar-nacles are quiet, orderly individuals, nev-er moving from the spot which they havechosen as a resting-place unless this hap-pens to be upon a living animal or some floating object. So you see barnacles are really morehighly developed in youth than they are later in life. Be-fore growing into perfect barnacles they have, parted withtheir sight, and with the power of moving or swi
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1887
