. Beginners' Zoology . -Section of one ray and central portionof \, fi.,/?,, tube feet more or less extended; att, eye-spot;k, gils; da, stomach; ;;/, niadreporite; &t, stone canal;/, ampulla; ei\ ECHINODERMS {SFINY ANIMALS) 37 Respiration. — The system of water vessels senrs the additionalpin-pose of bringing water containing oxygen into contact withvarious parts of the body, and the starfish was formerly thoughtto have no special respiratory organs. However, there are holes inthe aboral wall through which the folds of the delicate lining mem-brane protrude. These are now su
. Beginners' Zoology . -Section of one ray and central portionof \, fi.,/?,, tube feet more or less extended; att, eye-spot;k, gils; da, stomach; ;;/, niadreporite; &t, stone canal;/, ampulla; ei\ ECHINODERMS {SFINY ANIMALS) 37 Respiration. — The system of water vessels senrs the additionalpin-pose of bringing water containing oxygen into contact withvarious parts of the body, and the starfish was formerly thoughtto have no special respiratory organs. However, there are holes inthe aboral wall through which the folds of the delicate lining mem-brane protrude. These are now supposed to he gi//s {k, Fig. 58). The nervous system is so close to the aboral surface that muchof it is visible without dissection. Its chief parts are a neJie ringaround the mouth, which sends off a bi-anch along each branches may be seen by separating therows of tube feet. They end in a pigmentedcell at the end of each ray called the eye-spot. The food of starfish consists of such animalsas crabs, snails, and oysters. When the preyis too large to be taken into the mouth, thestarfish iiti-ns its stomach inside ont overthe prey (Fig. 59). After the shells separate,the stomach is applied to the s
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Keywords: ., bookcentury1900, bookdecade1920, bookidbeginnerszoo, bookyear1922
