Fig. 4 in Out of the Pacific: A second fossil porpoise from the Pliocene of the North Sea Basin

Fig. 4. Anterior view of the facial region of the skull of the extant porpoise Phocoena phocoena (Linnaeus, 1758) with both nasals present (A) and right nasal removed (B), to show the corresponding fossae on the corresponding frontal and maxilla. Dotted lines indicate the outline of the right nasal, both when present and when removed.