. Animal activities; a first book in zoo?logy. Zoology; Animal behavior. 2 24 /INIM/IL ACTIVITIES. and very many have two sets, the milk-teeth and the permanent teeth. The visceral cavity is divided by the diaphragm into two parts, the thorax or chest, and the abdomen. External ears are present in most cases. The heart has four chambers (Fig. 179). The nervous system differs from that of other verte-. 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 res


. Animal activities; a first book in zoo?logy. Zoology; Animal behavior. 2 24 /INIM/IL ACTIVITIES. and very many have two sets, the milk-teeth and the permanent teeth. The visceral cavity is divided by the diaphragm into two parts, the thorax or chest, and the abdomen. External ears are present in most cases. The heart has four chambers (Fig. 179). The nervous system differs from that of other verte-. 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 French, Nathaniel Stowers, 1854-. New York [etc. etc. ] Longmans, Green and Co


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