File:The Monograph of the Gymnoblastic or Tubularian Hydroids. Plate XVI.png

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Description
English: Podocoryna carnea and Hydractinia echinata (Hydrozoa: Anthoathecathae: Filifera: Hydractiniidae).
  • 1 – portion of a colony of Pocoryna carnea, magnified:
    • a – sterile hydranths in various states of contraction;
    • b – proliferous hydranths laden with planoblasts, the planoblasts in various stages of development.
  • 2 – a colony of Podocoryna carnea, natural size, spreading over the surface of a piece of submerged rock.
  • 3 – a planoblast just after its liberation from the trophosome floating in the water, and with its tentacles extended.
  • 4 – the same with its tentacle contracted and thrown up round the margin of the umbrella.
  • 5 – planoblasts in the act of swimming seen at the moment of systole, the umbrella strongly contracted and assuming a conical form.
  • 6 – a free planoblast more magnified, floating in the water, and with tentacles extended.
  • 7 – one of the oral lobes of the manubrium of the planoblast, showing its pencil of stalked thead-cells.
  • 8 – portion of the umbrella-margin of a planoblast:
    • a – marginal tentacle;
    • b – a radiating canal;
    • c – circular canal;
    • d – ectoderm of margin, where it forms a cushion-like thickening on the bulbous root of the tentacle;
    • e – ectoderm continued round the extreme margin of the umbrella.
  • 9 – A portion of the common basis of a young colony, showing its coalescent chitinous tubes.
  • 10 – Hydractinia echinata, vertical section through the common basal expansion extending from the free towards the attached surface; some of the coalescent chitinous tubes filled with coenosarc, others empty.
    • a – superficial layer of ectoderm extending over the free surface;
    • b – coenosarcal tube lying in one of the superficial chitinous channels;
    • c – walls of the adnate chitinous tubes;
    • d – proximal extermity of a hydranth, its cavity continuous with that of one of the coenosarc tubes of the common basis.
  • 11 – portion taken from the edge of the basal expansion of a colony of Hydractinia echinata, where it had been injured and is undergoing reparation; the chitinous tubes, with their coenosarcal contents, are seen extending themselves in the form of a network, the meshes of which subsequently become obliterated by the coalescence of the chitinous walls.
Date
Source Allman G. J. The Monograph of the Gymnoblastic or Tubularian Hydroids. – Conclusion of Part I and Part II. – London: Robert Hardwicke, 1972. – Plate XVI
Author
George James Allman  (1812–1898)  wikidata:Q744703 s:en:Author:George James Allman
 
George James Allman
Alternative names
G.J.Allman; George Allman; George J. Allman; G. J. Allman
Description British botanist, zoologist, university teacher and ecologist
Date of birth/death 1812 Edit this at Wikidata 24 November 1898 Edit this at Wikidata
Location of birth/death Cork Parkstone
Authority file
creator QS:P170,Q744703

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current19:03, 30 August 2014Thumbnail for version as of 19:03, 30 August 20142,531 × 3,567 (3.34 MB)Mithril (talk | contribs)=={{int:filedesc}}== {{Information |Description = {{en|1=Plate XVI from the Monograph of the Gymnoblastic or Tubularian Hydroids. The original description can be found [http://www.biodiversitylibrary.org/item/37418#page/70/mode/1up here].}} |Source...

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