. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. THOMSON : HIIIPIDISTIAN SNOUT 319 The roof and very thin side walls of the nasal capsule are, for the most part, fused with the overlying dermal bones. On the medial face of the lateral Avail of the capsule, immediately pos- terior to the fenestra eiidoiiarina, there is a small elliptically- shaped ridge of endocranial bone projecting into the nasal cavity. This ridge, which I have termed the crista lateralis (Figs. 5, 9, ), bears on its median face a groove (Figs. 5, 9, ) which, from its relation to the ext
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. THOMSON : HIIIPIDISTIAN SNOUT 319 The roof and very thin side walls of the nasal capsule are, for the most part, fused with the overlying dermal bones. On the medial face of the lateral Avail of the capsule, immediately pos- terior to the fenestra eiidoiiarina, there is a small elliptically- shaped ridge of endocranial bone projecting into the nasal cavity. This ridge, which I have termed the crista lateralis (Figs. 5, 9, ), bears on its median face a groove (Figs. 5, 9, ) which, from its relation to the external narial aperture, may have par- tially enclosed the tube for the external naris. The posterior wall of the capsule, in addition to being pierced by the canals which in all probability carried the ophthalmicus superficialis seventh and profundus fifth nerves mentioned by Romer (1937), has a large opening in the ventrolateral corner (Figs. 3, 4, 5, 10 D and E, ) —the posteroventral fenestra — the significance of which is rather enigmatical. Jarvik con- sidered a similar fenestra in Eusthenopteron to represent a. Figure 1. Ectosteorhachis. Ethmoid eudocranium in dorsal 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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