. A manual of elementary zoology . Zoology. THE DOGFISH 355 of these is rudi- mentary and dis- appears early in development. The mesonephros is a long, narrow organ, which in the adult female is reduced to a mere vestige and can only be found by removing the peritoneum, but in the male is better developed and, with its duct, makes a ridge along the body cavity. Its collect- ing tubules open directly into the Wolffian duct. The metanephros is a larger organ which forms a cushion- like swelling and is the principal excretory organ in both sexes; its collecting tubules, as will presently be expla
. A manual of elementary zoology . Zoology. THE DOGFISH 355 of these is rudi- mentary and dis- appears early in development. The mesonephros is a long, narrow organ, which in the adult female is reduced to a mere vestige and can only be found by removing the peritoneum, but in the male is better developed and, with its duct, makes a ridge along the body cavity. Its collect- ing tubules open directly into the Wolffian duct. The metanephros is a larger organ which forms a cushion- like swelling and is the principal excretory organ in both sexes; its collecting tubules, as will presently be explained, dis- charge into ducts of their own, which in the male do not enter the Wolffian duct. It is not .-â /â «â. '«./>â Fig. 254.âThe reproductive organs of a female dogfish. Seen m the frog, c/> Cloaca; part of the "falciform ligament where the whole , internal opening of the oviducts ; msn., meso- nephros; msov., mesovarium; mtn., metanephros; , oviduct; oesophagus; ov., ovary; rm. rectum ; shell gland ; ur"., ducts of metanephros u.£., urinary papilla; km., urinary sinus; Wolffian duct. kidney is mesone- phric. ⢠A duct,â the mesonephric or. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Borradaile, L. A. (Lancelot Alexander), 1872-1945. London : H. Frowde, Hodder & Stoughton
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1920
