"Brain of Polypterus. Upper aspect. a, medulia; b, corpora restiformia; c, cerebellum; d, lobi optici;…
"Brain of Polypterus. Lateral aspect. a, medulia; b, corpora restiformia; c, cerebellum; d, lobi optici;…
"Brain of Polypterus. Lower aspect. a, medulia; b, corpora restiformia; c, cerebellum; d, lobi optici;…
"Upper aspect of the primordial cranium, with the membrane-bones removed. An, angular; ao, anteorbital;…
"Lower aspect of the primordial cranium, with the membrane-bones removed. An, angular; ao, anteorbital;…
"Side view, with the membrane-bones. An, angular; ao, anteorbital; Ar, articulary; B, basal; D, dentary;…
"Lower aspect of the skull, part of the bones being removed on the side. An, angular; ao, anteorbital;…