Image from page 106 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14598279360)

Identifier: introductiontozo00dave

Title: Introduction to zoology; a guide to the study of animals, for the use of secondary schools;

Year: 1900 (1900s)

Authors: Davenport, Charles Benedict, 1866-1944 Davenport, Gertrude Anna Crotty, 1866-

Subjects: Zoology

Publisher: New York, Macmillan company London, Macmillian and co., ltd.

Contributing Library: MBLWHOI Library

Digitizing Sponsor: MBLWHOI Library

Text Appearing Before Image:

n limits.It would be an interesting occupation to sketch a numberof webs of Argiope showing the variations in the numberof radii and the other details of form. After the radii areplaced, the spiral lines are laid down. In the completedweb four regions are distinguishable, as follows, passingfrom the centre outward: (1) the notched zone, consist-ing of four to eight turns of a spiral at the centre; (2)the free zone in which no spiral is laid down ; (3) thespiral space, the main part of the spiral framework ; (4) the 1 orbis, circle ; tela, web. rs FIG. 83. — Diagram on nomencla-ture of parts of an orb-web. FS,foundation space; SS, spiralspace; CS, central space ; FZ,free zone; NZ, notched zone; H,centre. From McCook. THE SPIDER AXD ITS ALLIES 87 foundation space, without the spiral lines, and at the outermargin of the web. No study is more interesting thanthat of the details of construction of these parts of thespider web, while they are being made out of doors or inlarge glass jars.

Text Appearing After Image:

FIG. 84. — Orb-web of Epeira. a, first spiral line ; b, second spiral line; c, line to nest. From Emerton. 3. Line-weavers (Retitelarise1).--Of this group The-ridium is a type. The web consists of a fine irregular meshwith strands running above and below in various direc-tions.2 The spider stands below the main part of the net,back downward. 1 rete, net; tela, web. 2 Fig. 85. 88 ZOOLOGY 4. Tube-weavers (Tubitelarue 1). Here belong thespiders that spin webs in the grass, which are so conspicuousin the morning when laden with dew (Fig. 86). At oneside of the web a tube leads down among the grass stems.At the opening of this tube the spider stands ready to

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1944

Image from page 106 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900)

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