. Animal studies. THE ARTHROPODS 111 Crustacea, and in several points resemble the ancestral form from which all the modern species have descended. Some nearly related forms are provided with a great fold of the body-wall, which may almost completely conceal the animal from above, or it may be formed like a bivalve clam-shell, within which the entire body may be withdrawn. This A. Fig. 59.—Fairy-ehrimp (Branchipus). 5, brood-pouch ; e, e?, compound and simple eyes ; /, paddle-shaped feet; h, tu- bular heart; i, intestine. latter character is also found in the water-fleas (Dap7mia)9 very much s
. Animal studies. THE ARTHROPODS 111 Crustacea, and in several points resemble the ancestral form from which all the modern species have descended. Some nearly related forms are provided with a great fold of the body-wall, which may almost completely conceal the animal from above, or it may be formed like a bivalve clam-shell, within which the entire body may be withdrawn. This A. Fig. 59.—Fairy-ehrimp (Branchipus). 5, brood-pouch ; e, e?, compound and simple eyes ; /, paddle-shaped feet; h, tu- bular heart; i, intestine. latter character is also found in the water-fleas (Dap7mia)9 very much smaller forms, and sometimes occurring in mil- lions on the bottoms of our ponds and marshes. They are readily distinguished from the fairy-shrimp by the short- ness of the body, the small number of appendages, and by their habit of using their antennae as swimming organs, which gives to their locomotion a jerky, awkward character. 106. Cyclops and relatives.—Cyclops (Fig. 60), the repre- sentative of a number of lowly forms belonging to the order of Copepods, is one of the commonest fresh-water Crustacea- The forward segments of the spindle-shaped body are cov- ered by a large shield or carapace, the feet are few in num- ber, and, like its fabled namesake, it bears an eye in the center of the forehead. Nearly related species are also re- markably abundant at the surface of the sea, at times occur-. 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 Jordan, David Starr, 1851-1931; Kellogg, Vernon L. [from old catalog].
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Keywords: ., bookauthorjordanda, bookcentury1900, bookdecade1900, bookyear1903
