Buchia plicata(Zittel) and its allies, with a description of a new species,Buchia hochstetteri

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Abstract
Buchia plicata (Zittel, 1864) is illustrated by topotypes from Waikato South Head, New Zealand (Puaroan Stage, Lower Tithonian). Buchia blanfordiana (Stoliczka) from the Spiti Shales of Himalaya, judged by the lectotype and topotypes, is closely related to B. plicata. Specimens from the Edgar Range, Canning Basin, Western Australia, previously reported as Buchia spitiensis and B. spitiensis extensa, are illustrated and re-identified as Buchiaaff. blanfordiana (Stoliczka). Judged by the types and other specimens from Spiti, Buchia spitiensis forma typic a (Holdhaus) and B. spitiensis forma extensa (Holdhaus) are, as Holdhaus maintained, merely variants in a single population. New Zealand specimens formerly classed in Buchia extenso are distinguished as a related new species, Buchia hochstetteri, characteristic of a zone in the Puaroan underlying the type horizon of B. plicata. Lectotypes are chosen for Buchia plicata, B. blanfordiana, and B. spitiensis.

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