T KY Teikoku Daigaku Rika Daigaku Kiy Volume 20

T KY Teikoku Daigaku Rika Daigaku Kiy Volume 20

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 edition. Excerpt: ...brown. Introvert bears on the dorsal side numerous pigmented bands of a reddish brown or brownish black color. Papilla? black, tolerably large, but little elevated in the middle region of the body proper; they consist of brown plates which become gradually smaller towards the peripheral border. On the introvert-basis and the posterior end of body, the papilla? are conspicuously large and elevated. Hooks about 0.07 mm. high, provided with two sharp teeth at the apex and with warts (" Runzeln ") at the base; hook-rows about 15-17 in number, between them small hook-papilla? (" Hakenpapillen"). Eye-spots distinct. Tentacles, about 12, arranged in a semicircle above the mouth. Longitudinal muscles 20-21, rarely anastomosing. Four retractor muscles arising from the middle of the body-proper: the dorsal pair from the lst-2nd and the ventral from the oth6th longitudinal muscles. The intestinal convolution consists of 12-14 spirals, and has a fine spindle-muscle fixed at both ends. The one fixing muscle present is bifurcated towards the intestinal attachment. The segmental organs are half as long as the body proper; the anterior third or fourth of their total length is fixed by a mesentery to the body-wall. In Japan this species has been collected from the Hokkaido in the north to the Riukiu Islands in the south. As in many other cosmopolitan forms, the species shows remarkable variations, especially in color, according to different surrounding conditions. Specimens from the Riukiu (Loo-choo) Islands and the Ogasawara Islands exhibit all the essential characters described by Selenka (28) and other authors, --as, for instance, the black crescent-shaped markings on the introvert, papilla? and hooks of the same form and size, ...show more

Product details

  • Paperback | 108 pages
  • 189 x 246 x 6mm | 209g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236779983
  • 9781236779984