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I.—Cretaceous Mollusca from New Zealand

Published online by Cambridge University Press:  01 May 2009

C. T. Trechmann D.Sc., F.G.S.
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Extract

Shell oval in shape, very thin, consisting of six whorls, the last one very large and inflated. In some specimens the spire is rather prominent, in others slightly depressed with rather deep sutures. The apex and protoconch when not broken off are pointed and prominent. The aperture is broad in front but narrow behind, and seems to have a faint shallow anterior channel. There is no columellar fold. The outer lip in specimens where it is preserved is sharp and very slightly flattened out and expanded anteriorly. The growth-lines are fairly prominent, and there is a tendency for faint and shallow parallel furrows to develop, especially on the anterior portion. Height about 18 mm.

Type
Original Articles
Information
Geological Magazine , Volume 4 , Issue 8 , August 1917 , pp. 337 - 342
Copyright
Copyright © Cambridge University Press 1917

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References

page 337 note 1 für Min., N. J., Beil. Bd. xviii, pl. xviii, fig. 11, 1904.Google Scholar

page 337 note 2 Tert. u. quart. Versteinerungen Chiles, 1887, pl. xiii, figs. 2a, b, 4.

page 337 note 3 “Die Mollusken der Antarkt. Tertiarformation”: Wissensch. Ergebn. der Schwed. Sudpolar Exped., p. 29, pl. i, figs. 36a–c, 1911.Google Scholar

page 339 note 1 für Min., N.J., Beil. Bd. x, p. 27, 1895.Google Scholar

page 339 note 2 Bericht der Naturgesell. Freiburg, 1907, Bd. xv, p. 63Google Scholar.