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Sea Lamprey (Petromyzon marinus)
I. Then entire animal; note the seven gill-slits of which the first is marked g.s., the nostril n., and the unpaired median fins. II. Ventral aspect of the head; u.t., upper teeth; l.t., lower teeth; p., the piston in the mouth. III. Upper surface of the head; n., the nostril with the pineal groove behind it; e., the eye.
Source: Thomson, J. Arthur, Outlines of Zoology (1916)
(via: FETC)
Posted on April 1, 2012 via fauna with 32 notes
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