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Volume 52, 1920
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– 368 –

Rhynchonellidae.

Very few specimens of rhynchonellids have been obtained, and the absence of species of this family and of the Terebratulidae, although they are so common in correlative rocks in the Trelissick Basin and at Oamaru, makes the group, unfortunately, less valuable than it otherwise might be for purposes of correlation The species represented are as follows:—

Aetheia gaulteri (Morris).

Cf. Thomson, Geol. Mag., dec. 6, vol. 2, 1915, p. 389, fig. 1, a, b. A few specimens have been obtained from the Weka Pass greensand' from various localities, and are of the broad type described as Terebratella sinuata by Hutton.

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Fig. 1.—Rhizothyris elliptica n. sp.
Fig. 2.—Rhizothyris amygdala n. sp.
Fig. 3.—Rhizothyris curiosa Thomson.
Fig. 4.—Rhizothyris media n. sp.
Fig. 5.—Rhizothyris curta n. sp.
Fig. 6.—Rhizothyris rhizoida (Hutt.).
Fig. 7.—Rhizothyris orata n. sp.
Fig. 8.—Rhizothyris lateralis n. sp.
Fig. 9.—Rhizothyris pirum n. sp.
Fig. 10.—Rhizothyris scutum n. sp.
Fig. 11.—Rhizothyris elongata n. sp.

(All slightly reduced)

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Figs. 1, 2.—Rhizothyris fortis n. sp.
Fig. 3.—Rhizothyris elliptica n. sp.
Fig. 4.—Rhizothyris amygdala n. sp.
Fig. 5.—Rhizothyris pirum n. sp.
Fig. 6.—Rhizothyris obesa n. sp.
Fig. 7.—Rhizothyris rhizoida (Hutt.).
Figs. 8, 9.—Rhizothyris crassa n. sp.
Fig. 10.—Rhizothyris obesa n. sp.
Fig. 11.—Rhizothyris elongata n. sp.

(All slightly reduced)

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Fig. 1.—Rhizothyris curta n. sp.
Fig. 2.—Rhizothyris scutum n. sp.
Fig. 3.—Rhizothyris media n. sp.
Fig. 4.—Rhizothyris lateralis n. sp.
Fig. 5.—Rhizothyris curiosa Thomson.
Fig. 6.—Rhizothyris ovata n. sp.
Figs. 7, 8, 9.—Pachymagas bartrumi n. sp.
Figs. 10, 11, 12, 13.—Pachymagas hectori n. sp.
Figs. 14, 15.—Terebratulina cf. cancellata Koch.

(All slightly reduced)

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Figs. 1, 2, 3—Neothyris iheringi n sp
Figs. 4, 5, 6. 7—Pachymagas haast, n. sp.
Figs. 8, 9, 10, 11.—Pachymagas parki (Hutt.).
Figs. 12, 13, 14.—Pachymagas speighti n. sp

(All slightly reduced.)

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Hemithyris nigricans (Sow.).

A mutation of this well-known Recent species is found in the uppermost Mount Brown limestone (E). It differs from Recent specimens only in its slightly smaller size and slightly more imbricated growth-lines. A similar mutation is found in Park's upper Hutchinsonian of Target Gully, Oamaru district, the lowest horizon from which any specimens referable to this species have been found.