Notovola tainui Finlay, 1930
FINLAY, H. J. 1930. New shells from New Zealand Tertiary beds. Part 3. Transactions and Proceedings of the New Zealand Institute, 61: 49-84, pls. 1-6. [p. 51, pl. 4, figs. 46, 56; pl. 6, fig. 81]
«Notovola tainui n. sp. (Figs. 46, 56, 81).
Shell close to novaezelandiae (Reeve), but more inflated, especially towards the ventral margin, and more laterally expanded (less circular). Right (convex) valve with ribs same in number and arrangement, and with the same faint radial lineations and scratches on their surface; but the ribs are broader, flatter on top, with sharp edges, and the interstices are very much deeper, giving the appearance of deep channels scored across the surface instead of more or less rounded furrows. This is especially noticeable towards anterior side. The interior shows 14-15 strong square-cut ridges separated by interstices 1½-2 times their width; in the Recent species there are 16-18 ridges with interstices 1-1½ times their width. On the left valve there are about 14 very strong and high ribs (mostly higher than broad), evenly rounded on top, with interstices 2-3 times their width; novaezelandiae (Fig. 82) has about 16 considerably weaker ribs (broader than high), flattened on top, with interstices 3-4 times their width. The left valve is noticeably concave, while its Recent descendant has a mostly flat valve, concave only beneath the umbos. Interstices and sides of ribs on both valves, but especially the right, are densely ornamented with fine raised lamellae, equi-distant and several times their width apart; these are not noticeable in the Recent species. Height, 88 mm.; width, 100 mm.; thickness (1 valve), 29 mm. (type). Height, 109 mm.; width, 115 mm.; thickness (1 valve), 29 mm. (paratype) . Locality — Castlecliff "papa" (Castlecliffian). Type and one paratype, in Finlay collection. "Tainui" was the name of one of the first Maori canoes to reach New Zealand. If, as seems probable, this Castlecliff shell is the first migrant of this group of Pecten from Australia (or the north) to our shores, the specific name is not inept.» HAROLD JOHN FINLAY, 1930
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H. J. Finlay, 1930, plates 4, 6.
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