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Laboratory Manual in Elementary Biology

Laboratory Manual in Elementary Biology


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: STUDY IV. A STUDY OF A STAR-FISH. ASTERIAS VULGARIS. As an example of the radial or Echinoderm type. Material Required.?(1) A set of dried specimens; (2) a supply of alcoholic specimens; (3) one or more injected specimens; (4) some carefully dissected preparations; (5) preparation of the hard parts; (6) transverse sections of a ray and other microscopical preparations of tissues. Habitat. The Star-fish belongs to a group of animals which live only in salt water. It may be found abundantly in certain localities, notably in the oyster and clam beds along the coast, or attached to wooden piers and rocks below the surface of the water. The Star-fish, known among fishermen as the five- finger, is the principal enemy of the oyster and clam along the coast, and is a great obstacle to successful oyster culture. LABORATORY WORK. EXTERNAL MORPHOLOGY. A.? GENERAL FORM AND TOPOGRAPHY. (a) Note the general form of the animal. How many and what are the principal regions or parts of the body ? () Note that if each arm (ray) were cut off at its base a central portion (central disc) would remain. (c) Note the consistency of the body-wall (perisoma) and the character of its surface. (cf) Can you identify a head (anterior) region, and an opposite (posterior) or tail region in this animal ? (if) Examine and compare the upper (aboral) and lower (oral) surfaces, or aspects. (/) On the central disc of the aboral surface, note a wart-like structure (madreporite). Observe its structure (m) and sketch (X 4). (g) Note that the madreporite is located near the angle of two adjacent rays (interradial angle). How are the other rays arranged with reference to the madreporite? (K) Observe that one ray (anterior ray) is located directly opposite or across the centr...


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Product Details
  • ISBN-13: 9780217427548
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 68
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 0217427545
  • Publisher Date: 13 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 141 gr


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