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VI.—Note on the genus Tmaegoceras, Hyatt

Published online by Cambridge University Press:  01 May 2009

G. C. Crick
G. C. Crick
Affiliation:
British Museum (Natural History).
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Extract

In a recent number of the “Neues Jahrbuch” (1901, Bd. ii, Heft 3, pp. 158–170, 6 text illust.) Dr. J. F. Pompeckj, of Munich, has an interesting paper on the genus Tmaegoceras. The genus was established by Hyatt1 in 1889 for the two very rare Ammonites from the Lower Lias of the Alps, Ammonites latesulcatus, F. v. Hauer, and Arietites levis, G. Geyer. To these, in 1899, G. Bonarelli4 added a third species, Tmaegoceras Paronai, from the Lower Lias of the Central Apennines, at the same time assigning to this genus Schafhäult's Ammonites Helli. But as Mojsisovics pointed out in 1893, Schafhäutl's species is a Tropites, whilst Ammonites latesculcatus, F. v. Hauer, Arietites levis, G. Geyer, and Tmaegoceras Paronai, G. Bonarelli, have nothing whatever to do with that genus. Of these three species Dr. Pompeckj regards Ammonites latesulcatus, F. v. Hauer, and Tmaegoceras Paronai, G. Bonarelli, as generically identical, and with them he unites also Quenstedt's Ammonites dorsosulcatus and his own new species (T. crassiceps), which he describes from the Lower Lias (zone of Arietites Bucklandi) in the neighbourhood of Tübingen (Württemberg). He considers Arietites levis, G. Geyer, to be a true Arietite, probably related to Arietites ophioides (d'Orb.), Wähner, or Arietites Cordieri, Canavari.

Type
Original Articles
Information
Geological Magazine , Volume 9 , Issue 3 , March 1902 , pp. 127 - 128
Copyright
Copyright © Cambridge University Press 1902

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References

page 127 note 1 Hyatt, A., “Genesis of the Arietidæ”: Mem. Mus. Comp. Zool. Harvard Coll., xvi, No. 3 (1889), p. 125.Google Scholar

page 127 note 2 Hauer, F. v., “Über die Cephalopoden aus dem Lias der nordöstlichen Alpen”: Denkschr. Akad. Wissensch., Wien, Bd. xi (1856), p. 44, pl. ix, figs. 1–3.Google Scholar

page 127 note 3 Geyer, G., “Über die liasischen Cephalopoden des Hierlatz bei Hallstatt”: Abhandl. d. k.k. geol. Reichsanst., Wien, Bd. xii, No. 4 (1886), p. 252, pl. iii, figs. 10a–c.Google Scholar

page 127 note 4 Bonarelli, G., “Cefalopodi Sinemuriani dell' Appennino Centrale”: Palæontogr. ital., vol. v (1899), pp. 66–7, fig. 1.Google Scholar

page 127 note 5 Schafhäutl, , “Geognostische Untersuchungen des südbayerischen Alpengebirges,” 1851, p. 107, pl. xv, fig. 21.Google Scholar

page 127 note 6 Mojsisovics, E. v., “Die Cephalopoden der Hallstätter Kalke”: Abhandl. d. k.k. geol. Reichsanst., Bd. vi, No. 2 (1893), pp. 201, 202, 207.Google Scholar

page 127 note 7 Quenstedt, F. A.: “Die Ammoniten des Schwäbischen Jura,” p. 109, pl. xiii, figs. 33–35 (1885).Google Scholar

page 127 note 8 Pompeckj, J. F., “Ueber Tmacgoceras, Hyatt”: Neues Jahrb., 1901, ii, pp. 162–165, text-figs. 1a–i.Google Scholar

page 127 note 9 Wähner, Fr.: “Beiträge zur Kenntniss der tieferen Zonen des unteren Lias der nordöstlichen Alpen” (Beitr. zur Pal. Österr.-Ung., etc., Bd. vi, 1888), p. 164, pl. xxv, fig. 5.Google Scholar

page 127 note 10 Wähner:, Fr. op. cit., vi (Beitr. zur Pal. Österr.-Ung., etc., Bd. viii, Heft 4, 1891), p. 193, pl. xvii, figs. 1–4; pl. xviii, figs. 1–6.Google Scholar

page 128 note 1 Michelin, H.: Mag. de Zool., v (1835), Classe 5, pl. 67.Google Scholar