File:Text-book of comparative anatomy (1898) (14779684745).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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he unpaired terminal division (vagina) leading tothe exterior. The two ovaries are imbedded in a common envelopeof connective tissue, and suspended to the pericardial septum in themedian line by a ligament consisting of two muscles. They lie in theposterior portion of the body cavity. They are continued into the twouteri, which, close to the ovary, are united by an unpaired portion; VI PROTRACHEATA 433 separating again and winding about the intestine, they run first for-wards then outwards, and finally backwards towards the median line,where they reunite to form the unpaired vagina, whose outer aperturelies ventrally between the penultimate pair of legs. Each uterushas in the part nearest the ovaries two appendages, a reeeptaeulumseminis and reeeptaeulum ovorum. The former is a sac opening intothe uterus by means of two canals which unite at their mouths. This peculiar method of junction of the reeeptaeulum seminis andthe uterus is explained by ontogeny. The reeeptaeulum is originally
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FIG. 295.—Female sexual organs ofan older embryo of Peripatus Edwardsii(after Gaffron). U, Ovarial ligament; ov,ovarium ; ro, funnel portion of the reeepta-eulum ovorum ; rs, reeeptaeulum seminis ;:it, uterus; va, vagina. FIG. i.n;.— Male genitalapparatus of an adult Peri-patus Edwardsii spivail out(after Gaffron). t, Testis;cs, vesicula seminalis; «?, vasilrfcrcns ; de, cluctus ejacu-latorius. only a U-shaped loop of the uterus. The two limbs of the loops uniteat a later stage (Fig. 295, rs), fuse together at their ends, and openinto each other, the partition wall disappearing. The limbs of theU-shaped bend thus become the two connecting canals, and the medianpiece (the bend of the U) becomes the sac of the reeeptaeulum seminis.The reeeptaeulum ovorum, which enters the part of the uterus lyingbetween the ovary and reeeptaeulum seminis, consists of a funnel,which enlarges at its free edge into a blindly-closed sac of connectivetissue filled with fertilised eggs. Peripatus is vivi

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