. Geological magazine . „ „ 1833, p. 624. Ixi-lxvi ^ G. C. Crick—On Ammonites calcar. 555 British Museum (Natural History) that were also obtained fromDr. Bruckmann. The fact that the species is very rare and thatthis specimen has been labelled, ?Am. calcar, Zieten (unique), andmarked Zieten coll., at once suggested a comparison of theexample with Zietens figure. So exactly did it agree with Zietensfigure that I was led to enquire whether Zietens type-specimen wasknown to exist

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