. American spiders and their spinning work. A natural history of the orbweaving spiders of the United States, with special regard to their industry and habits. Spiders. THE SPINNING ORGANS. 43. Fio. 35. Three forms of spinning glands opening into the posterior spinneret, spn. The middle one enlarged in different proportion from the others, , a group of pyriform glands, , a bundle of ducts opening into the spinneret through the spinning field, SF. , treeform gland ; , excretory duct with brownish glandular walls or boundaries, bs; , cylindrical gland ; tu, its tubular part;

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. American spiders and their spinning work. A natural history of the orbweaving spiders of the United States, with special regard to their industry and habits. Spiders. THE SPINNING ORGANS. 43. Fio. 35. Three forms of spinning glands opening into the posterior spinneret, spn. The middle one enlarged in different proportion from the others, , a group of pyriform glands, , a bundle of ducts opening into the spinneret through the spinning field, SF. , treeform gland ; , excretory duct with brownish glandular walls or boundaries, bs; , cylindrical gland ; tu, its tubular part; am, ampullatc expansion of the same; , beginning of duct from the ampulla ; , cylindrical duct; do and k, the noose shaped twist of the duct continued in an external envelope, , derived ftom the 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 McCook, Henry C. (Henry Christopher), 1837-1911. [Philadelphia] The Author, Academy of Natural Science of Philadelphia

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Keywords: ., bookcentury1800, bookdecade1880, booksubjectspiders, bookyear1889