File:Text-book of comparative anatomy (1898) (14592418960).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. 111.—Sexual organs of a Polyclad(Leptoplana). To the left only the female,to the right only the male organs are depicted,o, Ovaries ; oo, oviduct ; u, uterus ; h,testes; «/, vasa deferentia ; s6, seminalvesicle; p, penis ; sd, shell gland; mo, malesexual aperture ; wo, female aperture. FIG. 112.—Sexual organsof a fresh-water Planarian(Triclad). l-s, Germaria ; ds,vitellaria ; h, testes ; ov, ovi-duct ; vd, vasa deferentia; p,penis; #0, common externalgenital aperture. reduced in number, but on the other hand are, in relation to the body,much larger than the single ovaries of the Polydada. Many formspossess ovaries only. The Accela, and the Macrostomidce among thelihabdoccela, have 2 lateral ovaries, the Microstomidce only 1 ovary.In many Ilhabdoccelidce so-called germ-vitellaria attain development,one often clearly separated portion of the ovary yielding only egggerms, the other only yolk. One single germ-vitellarium is found in the Prorhynchidcc. Proxenetes among theMesosto

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