. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. KUMMEL : POST-TRIASSIC NAUTILOID GENERA 399 deep lateral lobe. The general shape of the conch except for the degree of involution is rather similar in G. (Plummeroceras) and Pennoceras. Within the complex of Permian nautiloids now known it seems more logical to consider Permoceras an offshoot of the Domatoceras-Grypoceras evolving stock and thus a mem- ber of the Fig. 16. Diagrammatic representation of sutures and cross sections of Permoceras hitauniense (Haniel) A, B, and Pseudonautilus geinitzi (Opp
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. KUMMEL : POST-TRIASSIC NAUTILOID GENERA 399 deep lateral lobe. The general shape of the conch except for the degree of involution is rather similar in G. (Plummeroceras) and Pennoceras. Within the complex of Permian nautiloids now known it seems more logical to consider Permoceras an offshoot of the Domatoceras-Grypoceras evolving stock and thus a mem- ber of the Fig. 16. Diagrammatic representation of sutures and cross sections of Permoceras hitauniense (Haniel) A, B, and Pseudonautilus geinitzi (Oppel) C, B, all X 1. From Miller, and Collinson, 1953, fig. 1. Subfamily PARACENOCERATINAE Spath, 1927 When Spath established this taxonomic unit (originally as a family) he included in it Paracenoceras Spath, Tithonoceras RetoAvski, ^omalinautilus Spath, Aulaconaiotilus Spath, Carino- nautilus Spengler and with question Heminaiitilus Spath. Ex-. 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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