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This lamprey eel has a row of holes on its neck; these are openings that lead to its lungs; there are seven on each side, (Hooker, 1886).

Lamprey Eel

This lamprey eel has a row of holes on its neck; these are openings that lead to its lungs; there are…

An illustration of the median longitudinal section through anterior end of the sea lamprey. "a.v.o, Antrio-ventricular opening; br, Brain; br.o, Internal opening of gill sac; d.a, Dorsal aorta; d.c, Ductus cuvieri; h.v, Hepatic vein; i.j.v, Inferior jugular vein; N, Notochord; oes, Esophagus; olf, Olfactory organ; oc, Pericardium; p.c.v, Left posterior cardinal vein; pit, Pituitary tube; V, Ventricle; v, Velum." (Britannica, 1910)

Cross Section View of a Sea Lamprey

An illustration of the median longitudinal section through anterior end of the sea lamprey. "a.v.o,…