. Elements of comparative zoology. Zoology. FIG. 51.—Cypris herricki, an ostracode, enlarged After Turner. ORDER III.—OSTRACODA. These forms are enclosed in a firm bivalve shell into which all parts can be retracted and the valves closed like those of an oyster or clam. These forms are h Small, ' miy a . in length. They abound in the bottoms of fresh-water ponds and in brackish water. ORDER IV.—CIRRIPEDIA (Barnacles). In the Barnacles the body is usually enclosed in a calcareous shell composed of a number of parts, the shell being directly attached to some solid support, as in the acorn bar- n
. Elements of comparative zoology. Zoology. FIG. 51.—Cypris herricki, an ostracode, enlarged After Turner. ORDER III.—OSTRACODA. These forms are enclosed in a firm bivalve shell into which all parts can be retracted and the valves closed like those of an oyster or clam. These forms are h Small, ' miy a . in length. They abound in the bottoms of fresh-water ponds and in brackish water. ORDER IV.—CIRRIPEDIA (Barnacles). In the Barnacles the body is usually enclosed in a calcareous shell composed of a number of parts, the shell being directly attached to some solid support, as in the acorn bar- nacles so common on the rocks at the shore, or there is a fleshy stalk, as in the goose - barnacles (fig. 52). At one place the shell gapes and from this opening the six pairs of two-branched feet are protruded with a sweeping motion. These feet are finely haired and the interlacing hairs make a fine net which strains minute forms from the water and carries them to the mouth inside the shell. The calcare- ous shells caused the barnacles to be regarded as molluscs for a long time, but the nauplius stage in development, the two-branched jointed feet, and other features pro- claim them truly FIG. 52.—Goose - barna- cles (Lepas anatifera). After Schmarda. Mention should be made here of a large group of extinct. 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 Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1904
