. American spiders and their spinningwork. A natural history of the orbweaving spiders of the United States, with special regard to their industry and habits . thelong spinning spools. Of the four groujieds|)igots, three give exit to treeform glands; andthe one farthest towards the base is Middle spinneret, largely mag- ^yith a Cylindrical gland. The isolated Sl)00l nined. , spigot discharging cyhn- . iirioai giaiiii; ss, and ., spinning sp, (near ) also discharges a treeform gland. The middle s[)innerets are of a three facedpjTamidal form. (Fig. 22, M, and Fig. 2
. American spiders and their spinningwork. A natural history of the orbweaving spiders of the United States, with special regard to their industry and habits . thelong spinning spools. Of the four groujieds|)igots, three give exit to treeform glands; andthe one farthest towards the base is Middle spinneret, largely mag- ^yith a Cylindrical gland. The isolated Sl)00l nined. , spigot discharging cyhn- . iirioai giaiiii; ss, and ., spinning sp, (near ) also discharges a treeform gland. The middle s[)innerets are of a three facedpjTamidal form. (Fig. 22, M, and Fig. 24.)The bases arc directed towards the front, while their points, lying closelytogether, are turned immediately backward. They are unjointed.^ Thespinning field is triangular, and occupies almost the entire slope2. Middle q£ ^j^g spinneret from base to point. It contains quite a numberg, of long spinning spools, which may be approximately estimated at one hundred and fifty. On each middle spinneret there arealso three spinning sj^igots, of which two are close together at the tip,, and give issue to cylindrical glands. A little further back, another. spools of pyriforin glands; , spigotof treeform gland. spigot gives exit to a treeform gland, sj).t. Along the inner base3. Ante- .^yQ voMS of bristles. The anterior spinnerets are of stouter pro-rior Spm- ,. , • i i n n ^ • j- i • i portions anil more conical shape than tlie jiostenor, from which nerets. and the middle sj)innerets they are divided by quite an inter-vening space. (See Fig. 22, A, A.) Their inner bases arc almost in contactand are divided only by a tongue like chitinous leaf, Fig. 21, t. See Bueliolz and Landois. Meikcl (Uscribes them with two joints. THE SPINNING ORGANS. 37 . The spinnerets articulate obliquely from the outer side and the front, inward and backward, so that their tips approximate the corresi)ond- ing spinning fields of the mid-dle spinnerets. The base is covered on bo
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Keywords: ., bookcentury1800, bookdecade1880, bookidamericanspid, bookyear1889
