Illinois Biological Monographs Volume 1, Nos. 1-2

Illinois Biological Monographs Volume 1, Nos. 1-2

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 edition. Excerpt: ...2.0-3.0 mm. long by 0.1-0.2 mm. broad. First proglottids broader than long, 0.255 mm. broad by 0.017-0.020 mm. long. Mature proglottids as much as 0.85 mm. broad by 0.34-0.37 mm. long. Ripe proglottids longer than broad or quadrate 0.680 mm. broad by 0.90-1.00 mm. long. Old spent proglottids up to 2.0 mm. long by 0.4 mm. broad. Segmentation evident. Posterior angles of proglottids slightly projecting. No genital papilla. Genital pore marginal, irregularly alternating, situated at end of first of proglottid. Testes numerous, 75-80 or 90, in a single layer occupying entire field between vitellaria anterior to ovary. Breadth of testes 0.4-0.6 mm., length of same 0.07-0.10 mm. Vas deferens a large mass of coils in the mid-field. Ductus ejaculatorius with few or no coils. Cirrus slender, straight, muscular. Cirruspouch slender, nearly straight, muscular, 0.185-0.20-0.265 mm. long. Length of cirrus-pouch 2-3 times into proglottid width. Vagina always anterior to cirrus-pouch, never crossing the latter. Beginning region of vagina narrow. This region about 0.1 mm. long, terminated by weak sphincter vaginae. Adjacent to narrow region a dilated portion. Vagina not ciliated in any part of length. Vesicula seminalis present. Vitellaria with large follicles, not paralleling posterior margin of proglottid. Uterus when fully developed with 20-25 lateral outpocketings on either side. Uterine pores ventral, 2-3-4 in number. Eggs with three membranes. Embryos 0.014-0.0156-0.0168 mm., second membrane 0.026-0.031 mm., outer membrane 0.027-0.033 mm. in diameter. Excretory system has four main lateral trunks. Ventral vessels large, dorsal vessels much smaller. All main vessels sinuous or spiral. Many secondary openings to exterior. Habitat: In intestine more

Product details

  • Paperback | 132 pages
  • 189 x 246 x 7mm | 249g
  • United States
  • English
  • black & white illustrations
  • 123677129X
  • 9781236771292