Post-Triassic nautiloid genera by Bernhard Kummel

By Bernhard Kummel

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E. E. izumoensis Yokoyama, 1913 japonicus (Shimizu) 1926 javanus (Martin) 1879 johnsoni Miller, 1947 E. jonesi Miller and Thompson, 1933 E. labechi (d'Archiae and Haime) 1854 E. laverdei Durham, 1946 E. leonei (Negri) 1934 E. marksi Miller, 1947 E. marucoensis (Giovine) 1950 E. metafleuriavsi (Douvillfi) 1929 E. montanensi Kurnmel, 1954 E. montmollini (Pictet and Campiche) 1859 E. neubergicus (Redtenbacher) 1873 E. ) Cretaceous Queensland, (Lower) Australia Cretaceous India (Upper) Tertiary Japan Eocene Japan Tertiary Java Paleocene ?

Laverdei Durham 1946, pi. 63, fig. 4, diameter 61 mm. ru/ 380 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY generic g r o u p are the recognized species so gradational in charac­ ter and generally lacking in objectivity. Variability studies of large populations would be extremely helpful in assessing the many species groups. Since Eutrephoceras is interpreted as the basic persisting stock derived from the Cenoeeras complex, its relationships to the other genetic groups are discussed in detail under each of these derived groups and need not be repeated here.

Ind. No. ; D, C. demonensis (Gemmellaro) after M. ; E, C. ; F, C. ; G, C. ; H, C. ; / , C. ; J, C. mariani (Gemmellaro) after M. ; K, C. ; L, C. ; M, C. ; N, C. ; O, C. ; P, C. sp. ind. No. ; Q, C. truncatus (Sowerby) after Geyer, diameter 80 mm. ru/ KUMMEL : L'OST-TRIASSIC NAUTILOID GENERA 365 q Q o. ru/ 366 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY second " s i p h u n c l e " is undoubtedly an indentation o f the dorsal lobe. The only illustration of Bisiphytes reticulatus is a rather crude sketch ( r e p r o d u c e d here on Plate 25, fig.

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