. Bulletin. Science. T^NIOTD CESTODES OF NORTH AMERICAN BIRDS. 27 genital glands. The vas deferens (figs. 20, 21, v. clef.) forms a mass of coils in the anterior third of the segment extending from the median line to the base of the cirrus pouch. The cirrus pouch (figs. IT, 19, 21, 22, c. p.) is elon- gated, broadest near the base and tapering toward its outer end. It measures 350 to 380/x in length by 80 to lOOfx in thickness. It is covered with a layer of muscle fibers inter- lacing and crossing diago- nally, forming a sort of basket work (fig. 19). In the distal three-fifths of the pouch th
. Bulletin. Science. T^NIOTD CESTODES OF NORTH AMERICAN BIRDS. 27 genital glands. The vas deferens (figs. 20, 21, v. clef.) forms a mass of coils in the anterior third of the segment extending from the median line to the base of the cirrus pouch. The cirrus pouch (figs. IT, 19, 21, 22, c. p.) is elon- gated, broadest near the base and tapering toward its outer end. It measures 350 to 380/x in length by 80 to lOOfx in thickness. It is covered with a layer of muscle fibers inter- lacing and crossing diago- nally, forming a sort of basket work (fig. 19). In the distal three-fifths of the pouch this layer is very thick, but is thin in the proximal or basal por- tion of the pouch. The cirrus (figs. 19, 20, cir.) is from 250 to 350/x in length, about lOfx in diameter when evaginated, with a lumen about 2^ in diameter, and is armed with short spines 2 to Sfi long. A number of slender muscles, which extend from its inner end to attach to the distal portion of the pouch, serve as protractors. The portion of 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 Smithsonian Institution; United States. Dept. of the Interior; United States National Museum. Washington, Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off
Size: 1434px × 1743px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1900, bookdecade1900, booksubjectscience
