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Polyolcum at corresponding diameters. At the same time he states that it is a giant species, much bigger than the European polyolcum; in which case it would always have fewer constrictions than polyolcum at corresponding sizes. Spath (1930, p. 24, pl. 1, fig. 2a-d) sustained H. mesolcum as distinct but at the same time admitted that "it is connected by numerous transitions" to H polyolcum. In that case it is not distinct. Figure 21 shows the numbers ofconstrictions on the Mombasa specimens figured by Spath and Dacque plotted on a Figure 20 Holcophylloceraspolyolntm (Benecke).

CE331 (incomplete giant specimen): Puti Point, Kawhia Harbour. C. J. McNaught 1931. CE924 (fragments of a large specimen): GS5941, coast due east of Captain King's, east coast of Totara Point. Kawhia Harbour. J. McNaught. CE1678, CE2504: GS5941, Oraka Bay, east coast of Totara Point, Kawhia Harbour. R. Stevens. CE2724: GS5941. Oraka Bay. east coast of Totara Point. Kawhia Harbour. Loose on shore platform Collected by Margaret and Roger Cobb. 1991 University o f Auckland collections: C108: Ohineruru, Kawhia Harbour Collected by E.

There are about six or seven shallow constrictions per whorl, visible only on the internal cast. The constrictions are almost straight, being only very slightly sigmoidal (Fig. 16). The whorl cross-section is oval (Fig. 17). COMPARISONS: Gemmellaro (1872, p. 31) stated that his largest specimen was 285 mm in diameter and wholly septate, and the New Zealand specimens agree perfectly in proportions with the measurements tabulated for empedoclis, and also with the number of constrictions (six to eight), their shallowness, and the very fine ribbing.

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