. The chordates. Chordata. Opercular opening. Opercular opening Mouth-cavity Esophagus Nasal cavity Premaxillary \ "|,ernpiQl nans \ ., .,, \ \ Palatine \ Maxillary \ \ Nasal Eustachian opening Tympanic membrane. 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 Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston

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