Guide to the Aquarium of the Zoological Station at Naples Volume 15

Guide to the Aquarium of the Zoological Station at Naples Volume 15

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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. 1896 edition. Excerpt: ...the large portion of the body which forms the tail of the lobster, is reduced to a small round or triangular plate which is doubled up under the stomachregion and is therefore not seen from above. The anterior part of the body is laterally expanded and is mostly of a roughly triangular or square shape; the well known Shore-crab may serve as a type. To begin with, we would mention the Crabs with a triangular body. The first point which will attract notice in these, is the curious way in which. they are covered with all sorts of foreign substances; thus Pisa (Fig. 146) carries quite a forest of small algse and colonies of animals (Polyzoa and Hydroid-polypes) on its back and legs; Inachus (Fig. 145) carries about on its slender legs plants, sponges, and ascidians; in fact the more crabs we examine the greater is the variety of toilets that we see. And what is their use? They afford the best possible concealment from enemies and from prey. For all these objects have not fastened themselves on the crabs, but have been artistically placed there by the crab itself--we dare hardly say intentionally--but by reason of an inherited instinct which impels the animal to disguise itself in this way. All triangular Crabs are exceedingly slow in their movements, and dressed up in this way they resemble most closely a stone overgrown with sea-weed; especially as they have the habit of remaining quite motionless when alarmed. The apparatus for affixing these foreign bodies consists of a number of hooked bristles which are distributed all over the shell; there the crab deftly fastens with its claws the algae and other ornaments. The Larger Spider-crab, Maja squiuado (Fig. 49), covers its back with small stones and shells instead of with sea-weed. more

Product details

  • Paperback | 28 pages
  • 189 x 246 x 2mm | 68g
  • United States
  • English
  • black & white illustrations
  • 1236944925
  • 9781236944924