File:Origin of Vertebrates Fig 074.jpg

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English: Fig. 74.—Ventral half of Head-region of Ammocœtes.


Somatic muscles coloured red. Branchial and visceral muscles coloured blue. Tubular constrictor muscles distinguished from striated constrictor muscles by simple hatching. Tent., tentacles; Tent. m.c., muco-cartilage of tentacles; Vel. m.c., muco-cartilage of the velum; Hy. m.c., muco-cartilage of the hyoid segment; Ps. br., pseudo-branchial groove; Br. cart., branchial cartilages; Sp., space between somatic and splanchnic muscles; Th. op., orifice of thyroid; H., heart.


(All references in this work to Ammocœtes or Petromyzon appear to refer to the species now called Lampetra planeri.)
Date
Source The Origin of Vertebrates. https://archive.org/details/ost-biology-the_origin_of_vertebrates
Author Walter Holbrook Gaskell.


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The author died in 1914, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer.


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current16:51, 9 November 2013Thumbnail for version as of 16:51, 9 November 20131,782 × 3,189 (820 KB)Keith Edkins (talk | contribs)== {{int:filedesc}} == {{Information |Description={{En|Fig. 74.—Ventral half of Head-region of Ammocœtes. Somatic muscles coloured red. Branchial and visceral muscles coloured blue. Tubular constrictor muscles distinguished from striated constrict...

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