. The biology of marine animals. Marine animals; Physiology, Comparative. 656 THE BIOLOGY OF MARINE ANIMALS ceans and lamellibranchs. These shelters vary greatly in shape and com- position. A burrowing sea-anemone (Cerianthus) lines its burrow in the mud with mucoid material strengthened by nematocysts. Some amphipods, such as Amphithoe rubricata, live in tubular nests formed of weed frag- ments held together with threads secreted from pedal glands. A few lamelli- branchs, Lima, build nests of byssus threads. Tubes of phoronids have an organic base containing chitin, and are leathery, imp
. The biology of marine animals. Marine animals; Physiology, Comparative. 656 THE BIOLOGY OF MARINE ANIMALS ceans and lamellibranchs. These shelters vary greatly in shape and com- position. A burrowing sea-anemone (Cerianthus) lines its burrow in the mud with mucoid material strengthened by nematocysts. Some amphipods, such as Amphithoe rubricata, live in tubular nests formed of weed frag- ments held together with threads secreted from pedal glands. A few lamelli- branchs, Lima, build nests of byssus threads. Tubes of phoronids have an organic base containing chitin, and are leathery, impregnated with cal- careous material or strengthened with sand grains (6\b, 79, 136). Tubicolous animals, par excellence, are polychaetes, many of which secrete tubes of so-called mucoid material. Mucoid tubes vary in con- sistency from soft jelly {Myxicola, Flabelligera) to leather- or horn-like consistency (Chaetopterus, Hyalinoecia) (Figs. , and ). Fre- quently, foreign materials are deposited on a mucoid base, sand grains, mud and fine gravel in tubes of Lanice, Branchiomma, etc. (Fig. ). (a). 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 Nicol, J. A. Colin (Joseph Arthur Colin), 1915-. New York, Interscience Publishers
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