. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. TWO NEW 25 thin and flattened in the central part of the faces, but becomes columnar at the corners. Cell-boundaries are not easily seen. The large central space of each chamber is filled with a colloid secretion, more or less shrunken in alcoholic material. This substance, the silk, is carried to the tips of the hairs through ducts of varying length, one from each chamber (Fig. 4, b}. The terminal hairs (Fig. 4, a] are arranged in a row around the edge of the plantar surface of both the metatarsus and the second t
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. TWO NEW 25 thin and flattened in the central part of the faces, but becomes columnar at the corners. Cell-boundaries are not easily seen. The large central space of each chamber is filled with a colloid secretion, more or less shrunken in alcoholic material. This substance, the silk, is carried to the tips of the hairs through ducts of varying length, one from each chamber (Fig. 4, b}. The terminal hairs (Fig. 4, a] are arranged in a row around the edge of the plantar surface of both the metatarsus and the second tarsal joint. Though the latter is devoid of any secreting gland it possesses several ducts leading through it from the metatarsus. Some of the ducts lead along the periphery of the joint, others. FIG. 4. Rmbia texana. Portion of metatarsus, showing glands; a, spinning bristle ; l>, duct of silk-tube ; r, ampulla at base of duct. pass between the gland-chambers. The foot-tendon lies in large part between the two lower series of glands. In the glands, each duct arises from a remarkable ampulla (Fig. 4, c, d, e}. The wall of the duct suddenly becomes thickened, and then subdivides into four or five rays, which are continued in the form of the equidistant meridians of a sphere and meet again in an end-plate opposite the point of subdivision. Thus the lumen of each duct terminates proximally in four, or rarely five, large, elliptical or ovoid, lateral openings. At the base of each opening is a radial arrangement of fine processes, possibly the expression of the silk being drawn into the lumen of the tube. UNIVERSITY OF TEXAS, AUSTIN, TEXAS, March 22, 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annua
Size: 2067px × 1209px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
