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Volume 60, 1930
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Explanation Of Plate.

  • Fig. 1.—Notoplax (Amblyplax) brookesi Ashby. Tauranga Harb. Paratype, whole shell, showing girdle spicules, Ashby Coll. × 3.5.

  • Fig. 2.—Notoplax (Amblyplax) brookesi Ashby. Tauranga Harb. Holotype. Anterior valve, showing sculpture and teeth. Brookes Coll. × 4.

  • Fig. 3.—Notoplax (Amblyplax) brookesi Ashby. Tauranga Harb. Holotype. Median valve, showing sculpture, insertion-plate and sutural laminae, Brookes Coll. × 4.

  • Fig. 4.—Notoplax (Amblyplax) brookesi Ashby. Tauranga Harb. Holotype. Tail valve, showing sculpture, insertion-plate and sutural laminae. Brookes Coll. × 4.

  • Fig. 5.—Lepidopleurus finlayi Ashby. 60 fms., Otago Heads. Holotype. Anterior valve. Finlay Coll. × 7.

  • Fig. 6.—Lepidopleurus finlayi Ashby. 60 fms., Otago Heads. Holotype. Median valve. Finlay Coll. × 7.

  • Fig. 7.—Lepidopleurus finlayi Ashby. 60 fms., Otago Heads. Holotype. Tail valve. Finlay Coll. × 7.

  • Fig. 8a.—Lepidopleurus clifdenensis Ashby. Fossil, Clifden, bed 60. Broken, median valve, upper-side; half. Finlay Coll. × 7.

  • Fig. 8b.—Lepidopleurus clifdenensis Ashby. Fossil, inside of half, same valve as 8a, showing folding-over of tegmentum. × 7.

  • Fig. 9.—Lepidopleurus columnarius Hedley and May. 95 fms. Auckland Islands. Median valve, showing angle of divergence. Finlay Coll. × 7.

  • Fig. 10.—Callochiton kapitiensis Mestayer. Kapiti Island. Paratype. Whole shell, showing longl. ribbing. Ashby Coll. × 7.

  • Fig. 11.—Callochiton empleurus Hutton. Auckland Islands. Median valve, showing pits and longitudinal ridges. Ashby Coll. × 7.

  • Fig. 12.—Callochiton klemi Ashby. Foveaux Strait. Median valve, showing pits but no ridges. Dominion Museum. × 7.

  • Fig. 13a.—Callochiton chattonensis Ashby. Fossil, Chatton, Gore, Oligocene. Holotype. Median valve, showing shape, upper-side. Finlay Coll. × 7.

  • Fig. 13b.—Callochiton chattonensis Ashby. Fossil, inside of same valve as 13a. × 7.

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rows, which are regular in the dorsal and upper portion of the pleural area, but become confused towards the girdle; the lateral area is strongly raised, is only subgranulose, no regular granulose sculpture being present, but, as is so common in members of this genus, there are several irregular growth-ridges; the anterior margin of the raised lateral area shows under 20 mag. simple lens, a series of diagonal scratches or file-marks. The circular grains in the centre of the pleural area measure 60 mmm. in diameter whereas in L. inquinatus of a like size these grains are 48 mmm. or under.

Inside.—White, callus present, no insertion-plates, sutural laminae typical of members of this genus.

Locality.—Clifden (band 6A), Southland (Hutchinsonian, Lower Miocene).

Comparisons.—As compared with L. inquinatus the grains are larger and are somewhat convex, whereas in inquinatus the grains are flat-topped in the pleural and dorsal areas, also in inquinatus, in the lateral areas, the ornamentation is systematically granular and radial throughout most of the area, whereas in L. clifdenensis in this area there is no systematic, granular ornamentation at all; also it is more raised.

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