. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. STATUS OF INVERTEBRATE PALEONTOLOGY, 1953 177 who are unfamiliar with the fossil record and who may not be aware of the existence of the Monoplacophora regard the chitons as a separate class reflecting characters of the ancestors of the gastropods, if not all mollusks. As paleontologists we prefer to be guided by the fossil record and suggest the Monoplacophora for the ancestral role. Whether the Isopleura be regarded as a subclass or a separate class from the Anisopleura is relatively unimportant; if the current sepa
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. STATUS OF INVERTEBRATE PALEONTOLOGY, 1953 177 who are unfamiliar with the fossil record and who may not be aware of the existence of the Monoplacophora regard the chitons as a separate class reflecting characters of the ancestors of the gastropods, if not all mollusks. As paleontologists we prefer to be guided by the fossil record and suggest the Monoplacophora for the ancestral role. Whether the Isopleura be regarded as a subclass or a separate class from the Anisopleura is relatively unimportant; if the current separation is maintained, we feel that the Monoplacophora should be included with the chitons (see Figure 1). Stomach- Muscle^ scars Mouth. -A/entricle -Auricle Ctenidium Anus A. Primitive Isopleuran (left side view) Stomach Ventricle —Auricle. 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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