. Text-book of zoology for schools and colleges. Zoology. 124 INVERTEBRATE ANIMALS. The most familiar of the Tuhicola is the Serpula (Fig. 48, a), the contorted and winding tubes of which must be known to every one as occurring on shells or stones on the sea-shore. One of the cephalic filaments in Serpula is much developed, and its extremity forms a kind of conical plug which serves to close the mouth of the tube when the animal is retracted within it. In Spirorbis (Fig. 48, b) the shelly tube is coiled into a flat spiral, which is fixed to some solid object. It is of extremely common occurren
. Text-book of zoology for schools and colleges. Zoology. 124 INVERTEBRATE ANIMALS. The most familiar of the Tuhicola is the Serpula (Fig. 48, a), the contorted and winding tubes of which must be known to every one as occurring on shells or stones on the sea-shore. One of the cephalic filaments in Serpula is much developed, and its extremity forms a kind of conical plug which serves to close the mouth of the tube when the animal is retracted within it. In Spirorbis (Fig. 48, b) the shelly tube is coiled into a flat spiral, which is fixed to some solid object. It is of extremely common occurrence on the fronds of sea- weed, and on other submarine objects. Obdbe IV. Eekantia.—^The Annelides comprised in this order are called " errant" (Lat. erro, I wander), or " roving," from the fact that they all lead a free existence, and are never confined in tubes. They have always lateral unjointed ap- pendages, or foot-tubercles (Fig. 49), which carry tufts of. 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 Nicholson, Henry Alleyne, 1844-1899. New York, D. Appleton and Co.
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