File:Amphioxus Stage in which the external apertures of the body.jpg

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Fig. 64.—Stage in which the external apertures of the body, praeoral pit, mouth, first gill-slit, and anus have become perforated. Age about 36 hours. From the left side. (After HATSCHEK.)

al, Alimentary canal. an. Anus. b.c. Body-cavity. ch, Notochord. end. Endostyle. gl. Club-shaped gland, which has acquired an opening to the exterior on the left side below the mouth. .g.s'. First primary gill-slit. m. Mouth. n.c. Nervetube; the neurenteric canal has closed up, but the nerve-tube still curves round the hinder end of the notochord. np. Neuropore. p.o.c. Praeoral coelom (right head-cavity). p.p. Praeoral pit (left head-cavity). t, Provisional caudal fin.
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Source https://archive.org/details/cu31924001026131/page/117/mode/1up?view=theater Amphioxus and the ancestry of the vertebrates. New York, London, Macmillan.
Author Willey, Arthur

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current11:27, 24 March 2024Thumbnail for version as of 11:27, 24 March 2024616 × 2,235 (390 KB)Rasbak (talk | contribs){{information |description=Fig. 64.—Stage in which the external apertures of the body, paeoral pit, mouth, first gill-slit, and anus have become perforated. Age about 36 hours. From the left side. (After HATSCHEK.) al, Alimentary canal. an. Anus. b.c. Body-cavity. ch, Notochord. end. Endostyle. gl. Club-shaped gland, which has acquired an opening to the exterior on the left side below the mouth. .g.s'. First primary gill-slit. m. Mouth. n.c. Nervetube; the neurenteric canal has closed up, bu...

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