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

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Description
English: Hydractinia echinata (Hydrozoa: Filifera: Hydractinidae).
  • 1 – portion taken from the margin of a female colony: magnified;
    • a – hydranths in various states of contraction;
    • b – blastostyles laden with sporosacs;
    • c – spiral zooids.
  • 2 – a colony, natural size, spreading over the surface of a buccinum shell inhabited by a hermit crab.
  • 3 – a blastostyle from a male colony, more magnified than fig 1, laden with sporosacs.
  • 4 – transverse section of one of the chitinous spines from near the base:
    • a – ectoderm investing the surface of the spine;
    • b – endoderm occupying its furrows and channels;
    • b′ – one of the tubular cavities of the endoderm with its coloured lining;
    • c – one of the longitudinal chitinous ridges of the spine.
  • 5 – transverse section of one of the chitinous spines from near the summit.
  • 6 – a female sporosac seen in longitudinal section.
  • 7 – longitudinal section of the chitinous spines:
    • a – superficial covering of ectoderm;
    • b – endoderm with its included cavity occupying the superficial furrows of the spine;
    • c – the chitinous walls of the spine showing successive layers of deposition;
    • d – longitudinal chitinous ridges;
    • e – proximal portions of two hydranths from the superficial coenosarcal investment of the spine.
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 XV
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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This file has an extracted image: Hydractinia echinata, female colony (from Allman, 1872).png.
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current18:59, 30 August 2014Thumbnail for version as of 18:59, 30 August 20142,531 × 3,567 (5.59 MB)Mithril (talk | contribs)=={{int:filedesc}}== {{Information |Description = {{en|1=Plate XV from the Monograph of the Gymnoblastic or Tubularian Hydroids. The original description can be found [http://www.biodiversitylibrary.org/item/37418#page/66/mode/1up here].}} |Source...

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