. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. EASTMAN : sharks' TEETH AND CETACEAN BONES. 93 up the reflected inner wall of the bulla. The walls are thickest where the surface is rough, and thinnest over the smooth outer lip. Posterior end (Fig. E). — Viewed from behind, the most marked features are the bilobed form of the bulla, the large size and spongy- texture of the posterior processes (4, 11) of the tympanic and periotic, the continuity of the narrow tympano-periotic fissure (17), the large canal for the egress of the facial nerve already referred to (20),
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. EASTMAN : sharks' TEETH AND CETACEAN BONES. 93 up the reflected inner wall of the bulla. The walls are thickest where the surface is rough, and thinnest over the smooth outer lip. Posterior end (Fig. E). — Viewed from behind, the most marked features are the bilobed form of the bulla, the large size and spongy- texture of the posterior processes (4, 11) of the tympanic and periotic, the continuity of the narrow tympano-periotic fissure (17), the large canal for the egress of the facial nerve already referred to (20), and the large opening in the posterior wall of the promontory known as the fenestra cochleae (21). Anterior end (Fig. F). — Above is seen the obtuse forward extremity of the periotic, below the produced and spout-like termination of the Eustachian canal (19). The opening of the latter is not completely en- 7---. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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