Fig. 84.—Diagram of (A) Ventral Surface and (B) Lateral Surface of Ammocœtes, showing the arrangement of the Epithelial Pits on the Branchial Region, and their innervation by "VII.", the Facial, "IX.", the Glossopharyngeal, and "X1"-"X6", the Vagus Nerves. (All references in this work to "Ammocœtes" or "Petromyzon" appear to refer to the European Brook Lamprey, now called "Lampetra planeri".)