. 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. 114 AMERICAN SPIDERS AND THEIR SPINNINGWORK. hairs, and the linear thickenings of the tegument, in approaching these points, surround them in concentric circles. I have heretofore suggested that all action of the muscles upon the abdominal tegument may have much influence in the distribution of color for the formation of various patterns which mark Fig. 77 represents the tarsus and metatarsus of a Lycosid foot (Taran-
. 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. 114 AMERICAN SPIDERS AND THEIR SPINNINGWORK. hairs, and the linear thickenings of the tegument, in approaching these points, surround them in concentric circles. I have heretofore suggested that all action of the muscles upon the abdominal tegument may have much influence in the distribution of color for the formation of various patterns which mark Fig. 77 represents the tarsus and metatarsus of a Lycosid foot (Taran- tula), taken from the rejected skin. The tendons by which the tarsus and claw are moved are shown within the leg, and one sees the Tendons t]lickening 0f the tendons () at their free ends upon which the muscles are inserted. The claw and the entire dentition thereof, as may be seen, have left a perfect cast in the moulted tegument. The tendon passes from the claw in the form of a thick double cord, traversing the tarsus apart and uniting at the articulation with the metatarsus, which joint is traversed nearly to the articulation with the tibia, where the cords join with the short stout muscles in- serted into the cuticle at that *x« ®?k . point. The silk glands in Glands. l .. ° , moulting undergo changes both in form and number, as with the tubuliform glands of tarantula shown at Fig. 78, after the second and third moults. Three different forms of glands appear (gl 1, gl 2, gl 3), corresponding ... .., ,, u, iii- FIG. 78. Silk glands of a ta- possibly with the ampullate, tubuli- rentula at tne period8 of form, and pyriform glands of Epeira. second and third moults. Adult spiders of the two sexes, according to Wagner, do. 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 Christop
Size: 928px × 2695px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectspiders, bookyear1889
