File:Text-book of comparative anatomy (1898) (14776166501).jpg

Identifier: textbookofcompar01lang (find matches)
Title: Text-book of comparative anatomy
Year: 1898 (1890s)
Authors: Lang, Arnold, 1855-1914 Bernard, Henry Meyners Bernard, Matilda Haeckel, Ernst Heinrich Philipp August, 1834-1919
Subjects: Anatomy, Comparative
Publisher: London, New York, Macmillan and Co.
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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FIG. 168.—Ascaris lumbricoides,male genital apparatus, after Vogtand Yung, sf, Lateral lines; /(,testes ; d, intestine ; sb, sperm vesi-cle ; U, cloaca; de, ductus ejacula-torius.
Text Appearing After Image:
FIG. 11Hi.—Ascaris lumbricoides.female genital apparatus, afterVogt and Yung, vo, Female aper-ture ; v, vagina ; sf, lateral lines ; d,intestine ; u, uterus ; o, ovaries ; or,oviducts. forms a thin much twisted tube into which a solid axis (rachis)projects from the blind end; attached to this rachis the sperm cellsare found at different stages of development. The germ layer lies atthe blind solid end of the testicle tube. The nearer we approachto the efferent duct the more advanced are the stages of develop-ment and ripeness of the spermatozoa. The testicle division passesinto a shorter, wider, pouch-shaped division, the sperm vesicle, 256 COM PA RA TIVE A NA TOM Y CHAP. and this emerges by a short and narrow terminal piece, the duetusejaeulatorius, into the cloaca. Above the duetus ejaculatorius thereoften lie two elongated sacs, invaginations of the cloaca. Each saccontains a chitinous spiculum. In copulation the spicula may beprotruded from the cloacal aperture by special muscles

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