. Bulletin. Science. TiENIOID CESTODES OF NORTH AMERICAN BIRDS. 35 long as broad. The genital pores are irregularly alternate at about the middle of the segment. The genital sinus is deep and narrow. Internal anatomy. The ventral excretory canals are connected in the posterior portion of each segment by a transverse canal. The longitudinal muscles are arranged in two concentric layers, the inner layer {int. muse.) consisting of about 50 bundles, the outer {ext. muse.) of more numerous smaller bundles. Well-defined transverse fibers are present just inside the inner longitudinal layer. Dorso- v
. Bulletin. Science. TiENIOID CESTODES OF NORTH AMERICAN BIRDS. 35 long as broad. The genital pores are irregularly alternate at about the middle of the segment. The genital sinus is deep and narrow. Internal anatomy. The ventral excretory canals are connected in the posterior portion of each segment by a transverse canal. The longitudinal muscles are arranged in two concentric layers, the inner layer {int. muse.) consisting of about 50 bundles, the outer {ext. muse.) of more numerous smaller bundles. Well-defined transverse fibers are present just inside the inner longitudinal layer. Dorso- ventral fibers are very weakly developed. The sexual canals pass on the ventral side of the excretory vessels and the nerve. ext. ov. lOQ^x. Fig. 27.—Anonchot^nia globata : Sexually matuke segment, transverse section. c. Cirrus pouch, d. Dorsal excretory vessel, ext. muse. Outer longi- tudinal MUSCLES, int. muse. Inner longitUdIn'al muscles. I. Nerve cords. Ovary, Testicles, Vagina, i;. Ventral excretory vessel, y. Yolk gland. 31 ale reproductive organs.—The testicles (t.) are five in number located toward the dorsal surface in the anterior portion of the seg- ment. They measure when fully developed 30 to 40/^ in diameter. The vas deferens is somewhat tortuous, without, however, forming a mass of coils, and is without vesicular enlargements. The cirrus pouch ((?. p.) broadest at the base and tapering toward the end, measures from 70 to 80/i, in length by '25fx in diameter. Colin de- scribes the cirrus pouch as short, club-shaped, and " recht ; In my specimens the outer wall of the pouch is thin, with weakly developed 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 I
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