File:1911 Britannica - Pelagic larvae of A. lanceolatus.png
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![File:1911 Britannica - Pelagic larvae of A. lanceolatus.png](https://upload.wikimedia.org/wikipedia/commons/thumb/9/9b/1911_Britannica_-_Pelagic_larvae_of_A._lanceolatus.png/800px-1911_Britannica_-_Pelagic_larvae_of_A._lanceolatus.png?20120116014606)
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[edit]Description1911 Britannica - Pelagic larvae of A. lanceolatus.png |
English: Anterior region of two pelagic larvae of Amphioxus lanceolatus obtained by the tow-net in 8-10 fathoms, showing the asymmetry of the large lateral sinistral mouth with its ciliated margin cm and the dextral series of simple primary gill-slits (1ps-14ps). The larvae swim normally like the adult or suspend themselves by their flagella (not shown in the figures) vertically in mid-water. There is nothing in their mode of life which will afford an explanation of the asymmetry which is a developmental phenomenon. Lettering of upper figure.—anp, Anterior neural pore; bc, rudiment of buccal skeleton; c, cilia; cb, ciliated band; cc, ciliated groove; cm, cilia at margin of mouth; gl, external opening of club-shaped gland; Hn, Hatschek's nephridium; lm, left metapleur; n, notochord; pp, praeoral pit; ps, primary gill-slits, 1, 5, and 13; rm, right metapleur showing through. Lettering of lower figure.—a, Atrium; al, alimentary canal; bv, blood-vessel; cv, cerebral vesicle; df, dorsal section of myocoel (=fin spaces); e, “eyespot”; end, endostyle; gl, club-shaped gland; lm, edge of left metapleur; m, lower edge of mouth; n, notochord; nt, pigmented nerve tube; ps, primary gill-slits, 1, 9, and 14; rc, renal cells on atrial floor; rm, edge of right metapleur; so, sense organ opening into praeoral pit; ss, thickenings, the rudiments of the row of secondary gill-slits. Illustration from 1911 Encyclopædia Britannica, article Amphioxus. |
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Encyclopædia Britannica Eleventh Edition, Vol. 1, Page 890 ![]() |
Author | Encyclopædia Britannica, 1911 |
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This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States. | ![]() |
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