. Comparative physiology of vertebrate respiration. Vertebrates -- Respiration; Physiology, Comparative. OSTRACODERMS CHONDRICHTHYES PRIMITIVE CHORDATE Gills for filter- feeding Restriction of â gill slits: mouth supported by 2nd. visceral arch. ACTINOPTERYGII development of operculum. 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 Hughes, G. M. (George Morgan). Cambridge, Mass. , Harvard University Press

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