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Volume 58, 1928
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Subgenus Amblyplax Ashby, 1926.

Ashby, “Acanthoid Chitons of N.Z.” Proc. Mal. Soc. Lon., vol. 17, pt. 1, p. 18, type Notoplax (Amblyplax) oliveri Ashby = Macandrellus oliveri Mestayer.

Having multifissate tail-valve, posterior insertion-plate narrow, thickened, blunt-edged and fluted; girdle clothed with spicules or irregular, minute scales or both, girdle often asymmetrical.

Ashby, while using the names Loboplax and Amblyplax subgenerically, points out that they might with equal justice be considered sections only of the genus Notoplax, though the arrangement adopted seems the more convenient.

Notoplax (Amblyplax) oliveri.

Notoplax (Amblyplax) oliveri Ashby. Proc. Mal. Soc. Lon. vol. 17, pt. 1, April 1926, pp. 18–20, pl. 1, figs. 4 a, b, c.

Macandrellus oliveri Mestayer, Trans. N.Z. Inst., vol. 56, May 1926.

Ashby supplies photographs and gives a full description of a specimen dredged in 20fms. by Albert E. Brookes, on Atrina shell, between Kawau and Tiritiri Islands, Hauraki Gulf.

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Notoplax (Amblyplax) foveauxensis.

Notoplax (Amblyplax) foveauxensis Ashby. Proc. Mal. Soc. Lon. vol. 17, pt. 1, April 1926, pp. 20–22, pl. 1, figs. 5 a, b, c.

Acanthochiton foveauxensis Mestayer. Trans. N.Z. Inst. vol. 56, pp. 585–6, pl. 100, figs. 9–12.

Acanthochiton foveauxensis var. kirki Mestayer. (l.c.), pp. 586–587, pl. 101, figs. 1–4.

Loboplax rubiginosus Thiele, Rev. des Syst. der Chitonen, p. 38, pl. 5, figs. 16–17, 1909, not of Hutton.

Acanthochites rubiginosus Suter, J. Mal. 12, 68, pl. 9, figs. 12–17, not of Hutton.

Plaxiphora terminalis Wissel (l.c.), p. 609, pl. 21, fig. 22; pl. 23, figs. 23–24 (anatomy), not of Smith.

Acanthochites rubiginosus Iredale, Proc. Mal. Soc. Lon. vol. 9, pt. 3, p. 155, 1910. Stewart Island shells, not of Hutton.

Craspodochiton rubiginosus Iredale, (l.c.), vol. 11, pt. 2, p. 130, 1914, not of Hutton.

Ashby gives photographs and full description.

Type Foveaux Strait. Presented to Dominion Museum.

Notoplax (Amblyplax) rubiginosus.

Tonicia rubiginosa Hutton, Trans. N.Z. Inst., vol. 4, 1872, p. 180.

Acanthochites costatus Suter, Proc. Mal. Soc. Lon., vol. 2, pt. 5, p. 194, 1897, not of Adams and Angus.

Notoplax (Amblyplax) rubiginosus Ashby, “Acanthoid Chitons N.Z.” (l.c.)

Ashby figures a photo of the holotype and shows that it is an entirely different species from the preceding foveauxensis, with which it has hitherto been misidentified.

Type from Kapiti Island, West Coast, North Island, near entrance to Cook Strait, in the Dominion Museum.

Notoplax (Amblyplax) mariae.

Acanthochites (Loboplax) mariae Webster, Trans. N.Z. Inst. vol. 40, pp. 254–255, pls. 20, 21, figs. 1–11, 1908.

Acanthochites (Craspodochiton) mariae Iredale, Proc. Mal. Soc. Lon. vol. 9, pt. 2, p. 102, 1910.

Notoplax (Amblyplax) mariae Ashby, “Acanthoid Chitons N.Z.” (l.c.)

Ashby figures photos of paratype and gives full description.

Type from Orua Bay, Manukau Harbour; on rocks at low tide.

In the Webster collection.

Notoplax (Amblyplax) mariae stewartiana.

Loboplax stewartiana Thiele, Rev. des Syst, der Chitonen, p. 37, pl. 5, figs. 8–12, 1909.

Iredale (l.c.) considered this species to be conspecific with the preceding.

Notoplax (Amblyplax) mariae stewartiana Ashby, “Acanthoid Chitons of N.Z.” (l.c.)

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Ashby figures photos of the holotype which was lent for the purpose by the Museum d'Histoire Naturelle, Paris, and gives full description of same. Type from Stewart Island. In Mus. d'Hist. Nat. Paris.

Notoplax (Amblyplax) mariae haurakiensis.

Notoplax (Amblyplax) mariae haurakiensis Ashby, “The Acanthoid Chitons of N.Z.” (l.c.)

Ashby gives full description and figures.

Type on Atrina shell in 20fms. Hauraki Gulf, dredged by Brookes. Presented to Auckland Museum.

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