File:A biology of Crustacea (1961) (20382165425).jpg

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Title: A biology of Crustacea
Identifier: biologyofcrustac00gree (find matches)
Year: 1961 (1960s)
Authors: Green, J. (James), 1928-
Subjects: Crustacea
Publisher: Chicago, Quadrangle Books
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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BEHAVIOUR 85 The picture built up in a compound eye of this sort is a mosaic of light and dark spots, each perceived by an individual element. The visual acuity of several Crustacea has been tested by placing them in a round dish, then rotating a pattern of stripes around the dish and finding the finest stripes that the creature responds to, either by swimming in an attempt to keep the same position in relation to a particular group of stripes, or by movements of its eyes show- ing that it is seeing the stripes as they move past. In this way it has been found that the visual acuity is greatest when the proximal pigment is expanded around the retinulae. This is probably effective DISTAL PICMENT CELLS
Text Appearing After Image:
Fig. 39. Diagrammatic section through the eye of a crayfish. The right side is shown in the light adapted state, and is drawn from a thicker section than the left side which is in the dark adapted condition. in reducing stray reflexions from the back of the eye. The distal pigment does not seem to have much effect on visual acuity, but it may be useful in decreasing the sensitivity of the eye in bright light. There is some evidence that crabs and lobsters use their eyes when hunting, and can see quite well. One striking example was found during some experiments on hermit crabs. These were being- kept in artificial shells made of glass, so that the soft, succulent- looking abdomen was visible. A starved Portunus puber, a most pugnacious crab, which was in the same aquarium, made violent

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Flickr tags
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  • bookid:biologyofcrustac00gree
  • bookyear:1961
  • bookdecade:1960
  • bookcentury:1900
  • bookauthor:Green_J_James_1928_
  • booksubject:Crustacea
  • bookpublisher:Chicago_Quadrangle_Books
  • bookcontributor:MBLWHOI_Library
  • booksponsor:MBLWHOI_Library
  • bookleafnumber:107
  • bookcollection:biodiversity
  • bookcollection:MBLWHOI
  • bookcollection:blc
  • bookcollection:americana
  • BHL Collection
  • BHL Consortium
Flickr posted date
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7 August 2015
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