. Elements of zoology, or, Natural history of animals / ed. by Reese. Zoology. TUBICOLJE THE SKRPULA. 421 of two pieces, which can be sep.;rat d to allow of its pro- trusion. 715. The arenicola , known to fisher- men by the name of lob-worm, is another species common on our coasts, and is eagerly sought as a bait. It burrows, like the earth-worm, in the sand, and the place of its ex- cavations may be known by the little heaps which it casts up. The branchial tufts are confined to the centre of the body, where they form on each side a series of bunches, which are remarkable, du
. Elements of zoology, or, Natural history of animals / ed. by Reese. Zoology. TUBICOLJE THE SKRPULA. 421 of two pieces, which can be sep.;rat d to allow of its pro- trusion. 715. The arenicola , known to fisher- men by the name of lob-worm, is another species common on our coasts, and is eagerly sought as a bait. It burrows, like the earth-worm, in the sand, and the place of its ex- cavations may be known by the little heaps which it casts up. The branchial tufts are confined to the centre of the body, where they form on each side a series of bunches, which are remarkable, during the life of the creature, for their beautiful red colour, derived from the crimson blood which circulates copiously through them. Order —Tubicolae. 716. Comparatively little is known of the structure of the animals of the order Tubicolae, which never attain to such great dimensions, and do not offer to the naturalist the same facilities for examination. The structure of the casings which they form, however, has been fully inves- tigated. One of the commonest of these is the shelly tube exuded by the Serpula. This is formed of calcareous matter resembling that of the shells of Mollusca, and apparently secreted from the surface of the body in a similar manner. These tubes, which are often very greatly contorted in form, are generally found incrusting the sur- face of stones or other bodies which have been immersed for any iength of time at the bottom of the sea ; they are closed i , . , . •'. j Serpula Contortupli- at one end, which tapers to a point, and cata, taken out of its the wide end is open. mbe 717. The animal forming this shell has its branchial fiiaments all assembled round the head, where they form a pair of most elegant fan-like appendages, which usually possess very brilliant colours. At the base of each tuft is a fleshy filament; and one of these, on the right or left. 749. What of the next order? 7f>0. Describe the several Please note t
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