. Animal activities; a first book in zoo?logy. Zoology; Animal behavior. 142 y4NlM/4L ACTiyiTIES. Compare this starfish with the brittle starfish. Summary of Drawings, (a) Sketch of a living starfish. (3) Sketch of a portion of an ambulacral area show- ing the relative positions of the plates and the openings for the ambulacral feet. (c) Cross-section of an arm to show the relative posi- tion of feet, water-tube, plates, and spines. (d) Ambulacral feet with ampullae. {e) Sketch of a brittle starfish. Activities of the Starfish. The starfish belongs to the sub-kingdom Echinodermata, animals hav
. Animal activities; a first book in zoo?logy. Zoology; Animal behavior. 142 y4NlM/4L ACTiyiTIES. Compare this starfish with the brittle starfish. Summary of Drawings, (a) Sketch of a living starfish. (3) Sketch of a portion of an ambulacral area show- ing the relative positions of the plates and the openings for the ambulacral feet. (c) Cross-section of an arm to show the relative posi- tion of feet, water-tube, plates, and spines. (d) Ambulacral feet with ampullae. {e) Sketch of a brittle starfish. Activities of the Starfish. The starfish belongs to the sub-kingdom Echinodermata, animals having hard plates in the skin. Their movements are slow and all- their activities are of a low order, yet they are more highly specialized than the Coelenterates w e have just been con- sidering. Taking Food. The mouth of the starfish is situated on the under side, hence this side is called the oral side. There are no teeth, yet the starfish lives on oysters, clams, mussels, and other hard-shelled animals. The stomach is an elastic bag which fills the central part of the body and extends into all the arms or rays, thus making the shell simply a protection for this branching, walking stomach. This stomach secretes a fluid which par- tially paralyzes its prey. If a mussel is too large to pass through the mouth, the starfish stretches a part of its stomach outside of its body, and enfolds its. Fig. u6.—A Starfish. After Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original French, Nathaniel Stowers, 1854-. New York [etc. etc. ] Longmans, Green and Co
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