. American spiders and their spinningwork. A natural history of the orbweaving spiders of the United States, with special regard to their industry and habits . that the Tubuliform glands secrete thecocooning stuff, or the threads which envelop the eggs. The curled threads Bau uud Function der Spinndriisen der Araneida. Von Carl Apstein. Archiv fiirNaturgeschichte, 18S9, pages 29-74, Plates III., IV., V. (357) 358 AMERICAN SPIDERS AND THEIR SPINNINGWORK. characteristic of Uloborus, Ilyptiotes, and Dictj^na are secreted by what hecalls the Cribellum gland. The Lobate glands prepare the threads b
. American spiders and their spinningwork. A natural history of the orbweaving spiders of the United States, with special regard to their industry and habits . that the Tubuliform glands secrete thecocooning stuff, or the threads which envelop the eggs. The curled threads Bau uud Function der Spinndriisen der Araneida. Von Carl Apstein. Archiv fiirNaturgeschichte, 18S9, pages 29-74, Plates III., IV., V. (357) 358 AMERICAN SPIDERS AND THEIR SPINNINGWORK. characteristic of Uloborus, Ilyptiotes, and Dictj^na are secreted by what hecalls the Cribellum gland. The Lobate glands prepare the threads bywhich the insect is swathed previous to being eaten. Possibly, however,several glands take part in furnishing the swathing bands. The Pyriformglands secrete the si^inningwork which forms the snare proper, or theseizing tissue, together with the dragline and trapline. I would venture toadd to this the suggestion that the same glands must also secrete the fila-ments which form the ballooning thread and floating strands known asgossamer. The function of the Aciniform glands and Ampullate glands,according to Dr. Apstein, is not known. (See Figs. 348-354.).
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