Family Lepidopleuridae Pilsbry, 1892.

Lepidopleurus inquinatus Reeve, 1847.

In the collection are one tail-valve and three median valves from Castlecliff, Wanganui (Pliocene); and one tail-valve from Target

Gully, Oamaru (Awamoan, Miocene). One of these median valves has granules smaller, less flattened, less coalesced and shows bridging, but as I have noticed this latter feature between the longitudinal ribbing in some recent specimens, I do not separate this.

Lepidopleurus finlayi Ashby, 1929. (Figs. 5, 6, 7).

There are two worn portions of two median valves that I consider are referable to the new species discovered by Dr. Finlay in 60 fms. off Otago Heads, which is referred to in the introduction herein and which is being described in a separate paper.

Locality.—Castlecliff, Wanganui (Pliocene).

Lepidopleurus clifdenensis n. sp. (Figs. 8a, 8b).

In the collection are two pieces of evidently a single median valve, marked “Ischnochiton? sp.”; this valve has no insertion-plates but the sutural laminae are in an excellent state of preservation; it is certainly a typical Lepidopleurus but distinct from L. inquinatus.

Upper-side.—Colour grey, dorsal and pleural areas decorated with longitudinal rows of minute, circular, subconvex granules which, although almost touching, do not coalesce; I count about 30 of these