. An introduction to zoology, with directions for practical work (invertebrates). 350 INTRODUCTION TO ZOOLOGY n&t:slz£. with serpentine bends, but without the complicated twists of a Harlequin. Like the latter, this larva makes mud-tubes, but it leaves them very fre- quently. The head bears a pair of antennae that can be completely withdrawn within it. The first segment of the body bears a pair of hooked structures fused at the base, und the last segment bears a similar pair, but larger and widely separate in this case. In all these, the circlet of hooks can be withdrawn within the soft fl
. An introduction to zoology, with directions for practical work (invertebrates). 350 INTRODUCTION TO ZOOLOGY n&t:slz£. with serpentine bends, but without the complicated twists of a Harlequin. Like the latter, this larva makes mud-tubes, but it leaves them very fre- quently. The head bears a pair of antennae that can be completely withdrawn within it. The first segment of the body bears a pair of hooked structures fused at the base, und the last segment bears a similar pair, but larger and widely separate in this case. In all these, the circlet of hooks can be withdrawn within the soft flesh, and in swimming the hind append- ages move with a quite regular stroke; their tips and the hooks being first indrawn and then suddenly shot out again, separating as widely as possible. The fused appendages in the first segment are used chiefly when moving over a surface, when the whole body seems to be pulled and hitched forward on them as on a kind of crutch. The last segment bears four little gills and two other processes, each having on it a bunch of stiff hairs. The pupa also is aquatic, and re- sembles that of gnats, having much the same shape, and a similar pair of respiratory tubes on the thorax. It is, however, of a paler yellow- brown colour; also it generally rests below the water, appar-. The Pupa. Fig. 272.—Tanypus (larva). 1, Fused front appendages ; l^^ back, hooked appendages ; g, gills. Egg cluster is x 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 Lulham, Rosalie Blanche Jermaine. London, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherlondo, bookyear1913
