File:Text-book of comparative anatomy (1898) (14592288930).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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tion a-b-c of Fig. A. «-6,Perradius; b-c,adradius; are Usually developed; these are sometimes folded, or curled,or clustered, and occasionally umbrella; ga, jelly; tg, tentacular vessel; b-b, of considerable size ; they lie principal axis. in the suijumbrellar wall of the gastro-canal system, sometimes nearer the circumference, at other timesnearer the central gastric cavity. In the Pelagidce and Cyanide? thegonades hang down as 4 gastro-genital sacs from the subumbrella intothe umbrella cavity; in the Ehizostomce and Aurelidce, on the contrary,they lie on the upper surface of the subgenital cavities or the sub-genital porticus (Fig. 70, p. 85). In the Craspedota the ripe genitalproducts pass directly out into the umbrella cavity by the bursting ofthe gonade; in the Acraspeda they pass inward into the cavity of thegastro-canal system, and reach the exterior thence through the mouth.The sexual organs of Corals lie in the septa, near the free edgeswhich project into the gastral cavity.
Text Appearing After Image:
FIG. 77. — Eucope campanulata, partly afterHaeckel. A, From the surface. B, Section in the t, tentacle; sb, marginal vesicle; g, gouades; mr,gastric peduncle; r, radial canals; v, velum ; ri,circumferential canal; ex, exumbrella; su, sub- n CNWARIA— STRATIFICATION OF BODY 103 In the hermaphrodite Ctenophora we meet with them on or in thewalls of the meridional vessels, in such a way that on the one wall ofthe meridional vessel the male elements lie, and on the opposite wallthe female elements. These sexual glands are so arranged that ineach of the 8 regions of the body, separated by the meridians, thereare either 2 testes or 2 ovaries. The ripe sexual products fall intothe meridional vessels, and through the gastro-canal system reach thestomach and oesophagus and pass out through the mouth. In the Cnidaria no special ways of transmission for the sexualproducts, and no special copulatory organs, are developed. Concerning the origin of the sexual products we may say, generally, that

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