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Volume 38, 1905
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Family Rotaliidæ.
Subfamily Rotaliinæ.
Genus Truncatulina, d'Orbigny.
Truncatulina tenuimargo, Brady.

Truncatulina tenuimargo, Brady, 1884, Rep. Chall., vol. ix, p. 662, pl. xciii, figs. 2, 3. Egger, 1893, Abhandl. k. bayer. Ak. Wiss., cl. ii, vol. xviii, abth ii, p. 399, pl. xvi, figs. 7–9.

This elegant little species is apparently almost confined to the Southern Hemisphere. It has already been found off the shores of New Zealand, and is a well-known Australian species. Our specimens have the keel strongly accentuated, and the chambers showing a nodulous appearance on the inferior surface as in Brady's figure 2.

Not common in our sample.

Truncatulina reticulata, Czjzek sp.

Rotalina reticulata, Czjzek, 1848, Haidinger's Naturw. Abhandl., vol. ii, p. 145, pl. xiii, figs. 7–9.

Planorbulina reticulata. Cz. sp., Goes, 1896, Bull. Mus. Comp. Zool. Harvard, vol. xxix, No. 1, p. 72.

Truncatulina reticulata, Cz. sp., Flint, 1899, Rep. U.S. Nat. Mus. (1897), p. 334. pl. lxxviii, fig. 3. Chapman, 1901, Journ. Linn. Soc. Lond. (Zool.), vol. xxviii, p. 194. Millett, 1904, Journ. R. Micr. Soc., p. 491.

T. reticulata has been previously found in the South Pacific, but it does not seem to have been recorded from the neighbourhood of the present locality. It is very rare in our series.

Truncatulina wuellerstorfi, Schwager sp.

Anomalina wuellerstorfi, Schwager, 1866, “Novara” Exped., geol. Theil, vol. ii, p 258, pl vii, fig. 105.

Truncatulina wuellerstorfi, Schwager sp, Flint, 1899, Rep. U.S. Nat. Mus. (1897), p. 333, pl. lxxvii, fig. 1. Millett, 1904, Journ. R. Micr. Soc., p. 492.

The above species is represented in the present series by a fair number of specimens. It does not appear to have been recorded from the vicinity of Great Barrier Island.

Brady regards this form as of essentially deep-water habit. In the South Pacific its range in depth is from 210 to 1940 fathoms, so that it is rather surprising to meet with so many typical specimens in our sounding at 110 fathoms.

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Truncatulina lobatula, Walker and Jacob sp.

Nautilus lobatulus, Walker and Jacob, 1798, Adams's Essays, Kanmacher's ed., p. 642, pl xiv, fig. 36.

Planorbulina lobatula, W. and J. sp., 1894, K. Svenska Vet.-Akad. Handl., vol. xxv, p. 88, pl. xv, fig. 774.

Truncatulina lobatula, W. and J. sp., Chapman, 1902, Proc. R. Soc. Edin., vol. xxiii, p 392, pl. i. figs. 2, 3. Millett, 1904, Journ. R. Micr. Soc., p. 491.

Three typical specimens were found in the present sample. The species has been already recorded from the east coast of New Zealand (sta. 169).

Truncatulina variabilis, d'Orbigny.

Truncatulina variabilis, d'Orbigny, 1826, Ann. Sci. Nat., vol. vii, p. 279, No 8. Egger, 1893, Abhandl. k. bayer. Ak. Wiss., cl. ii, vol. xviii, abth. ii, p. 404, pl. xvi, figs. 57–59, 63, 64. Chapman, 1901, Journ. Linn. Soc. Lond. (Zool.), vol. xxviii, p. 193. Millett, 1904, Journ. R. Micr. Soc., p 492.

This species is rare in the present series. The examples found are characteristic.

Truncatulina ungeriana, d'Orbigny sp.

Rotalina ungeriana, d'Orbigny, 1846, Foram. Foss. Vienne, p. 157, pl. viii, figs. 16–18.

Planorbulina ungeriana, d'Orb. sp., Goes, 1894, K. Svenska Vet.-Akad. Handl., vol. xxv, p. 90, pl. xv, fig. 780.

Truncatulina ungeriana, d'Orb. sp., Flint, 1899, Rep. U.S. Nat. Mus. (1897), p. 333, pl. lxxvii, fig. 2. Chapman, 1901, Journ. Linn. Soc. Lond. (Zool.), vol. xxviii, p. 194. Millett, 1904. Journ. R. Micr. Soc., p. 493.

The specimens met with are fairly numerous, and one example shows a tendency towards a redundant growth of the last chamber.

Truncatulina akneriana, d'Orbigny sp.

Rotalina akneriana, d'Orbigny, 1846, Foram. Foss. Vienne, p. 156, pl. viii, figs. 13–15.

Truncatulina akneriana, d'Orb sp., Flint, 1899, Rep. U.S. Nat. Mus. (1897), p. 333, pl. lxxvii, fig. 5. Millett, 1904, Journ. R. Micr. Soc., p. 494.

Three typical examples found.

Truncatulina pygmæa, Hantken.

Truncatulina pygmæa, Hantken. 1875, Mittheil. Jahrb. ung. geol. Anstalt, vol. iv, p. 78, pl x, fig. 8. Flint, 1899, Rep. U.S. Nat. Mus. (1897), p. 334, pl. lxxvii, fig. 6. Chapman, 1901, Journ. Linn. Soc. Lond. (Zool.), vol. xxviii, p. 194.

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This species is usually found in deep water; it has, however, occurred in the lagoon at Funafuti, Ellice Islands. Very rare in the present series.

Truncatulina haidingeri, d'Orbigny sp.

Rotalina haidingeri, d'Orbigny, 1846, Foram. Foss. Vienne, p. 154, pl. viii, figs. 7–9.

Truncatulina haidingeri, d'Orb. sp., Brady, 1884, Rep. Chall., vol. ix, p 663, pl. xcv, figs. 7 a-c.

T. (Rotalina) haidingeri, d'Orb. sp., Egger, 1893, Abhandl. k. bayer. Ak. Wiss., cl. ii, vol. xviii, abth. ii, p. 401, pl. xvi, figs. 25–27.

T. haidingeri, d'Orb. sp., Millett, 1904, Journ. R. Micr. Soc., p. 493.

This species is very abundant in the present sounding, and it attains the unusually large size of 2·3 mm. in diameter. Besides the typical specimens there are some which seem to link, by their depressed superior face, the above species with a form like T. præcincta, Karrer, or T. dutemplei, d'Orb. sp. It is somewhat singular, considering its abundance, that this species has not bitherto been recorded from the locality.

Truncatulina (?) præcincta, Karrer sp.

Rotalina præcincta, Karrer, 1868, Sitzungsb. d. k. Ak. Wiss. Wien, vol. lvii, p. 189, pl. v, fig. 7.

Truncatulina præcincta, Karrer sp., Flint, 1899, Rep. U.S. Nat. Mus. (1897), p. 334, pl. lxxviii, fig. 1. Millett, 1904, Journ. R. Micr. Soc., p. 494.

A few specimens of a plano-convex form were met with. They are not quite typical, in having the limbate sutures only feebly developed.

Flint records T. præcincta from the Gulf of Mexico, at 169 and 196 fathoms, and Millett from the Malay Archipelago.