. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. 184 ZOOLOGY hydroids, the spongps/ the mussels, and the barnacles (Fig. 174), or else have some device for clinging fast, as in the case of the starfish, and many snails and crabs. At the opposite physiographic extreme we find the sea penetrating as a harbor deep into the The boundary between the sea and the land is in tliese cases often very uncertain. Fig. —An enclosed harbor or arm of the gca deep into the niainUrnd. because the semiaquatic plants grow far out into th
. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. 184 ZOOLOGY hydroids, the spongps/ the mussels, and the barnacles (Fig. 174), or else have some device for clinging fast, as in the case of the starfish, and many snails and crabs. At the opposite physiographic extreme we find the sea penetrating as a harbor deep into the The boundary between the sea and the land is in tliese cases often very uncertain. Fig. —An enclosed harbor or arm of the gca deep into the niainUrnd. because the semiaquatic plants grow far out into the water, forming the edge of a salt-marsh. Here twice a day the sea bottom is ex]iosed to the air l)y the retreating tide, and terres- trial animals wand(>r out upon it to feed. In this situation the permanent animals are those that burrow in the mud or pene- trate between the roots of marsh-grass or swim about on the surface of the water (Fig. 17G). These animals feed on the debris that floats on the surface of the water or else crawl about on the bottom to Ijrowse on the algfe which flourish 1 See C^haptcr XIX. ^ Fig. 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 Davenport, Charles Benedict, 1866-1944; Davenport, Gertrude Anna Crotty, 1866- joint author. New York, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1911
