Page:An Introduction to the Study of Fishes.djvu/106

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78
FISHES.

towards the Teleosteous type, the number of separable bones

Fig. 39.—Skull of Polypterus. (After Traquair.)

Fig. I. Upper aspect of the Primordial Cranium, with the membrane-bones removed. Fig. II. Lower aspect of the same. Fig. III. Side view, with the membrane-bones. Fig. IV. Lower aspect of the Skull, part of the bones being removed on one side. The parts shaded with oblique lines are cartilage of the primordial skull.
An, Angular; ao, anteorbital; Ar, articulary; B, basal; D, dentary; E,