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| A. Main ribs weakly developed. | |
| (a) Surface almost smooth, main ribs indicated by weakly incised lines. | diversum |
| (b) Ribs plainly defined, but very low | modicum |
| B. Main ribs well developed. | |
| (I) Medial ribs at 10 mm. from umbo 5 per mm. | |
| (a) Interstices narrow. | semitectum |
| (b) Interstices wide. | quinarium |
| (II) Medial ribs at 10 mm. from umbo 3 per mm. | pulchellum |
| (III) Medial ribs at 10 mm. from umbo 2 per mm. | finlayi |
Nemocardium (Pratulum) modicum n.sp. (Pl. 36, Figs. 17, 18.)
1937. Nemocardium (Pratulum) sp. Finlay and Marwick, N.Z.G.S. Pal. Bull. 15, p. 30. pl. 4, fig. 6.
Shell small. Main ribs, about 45, scarcely raised, broadly rounded, separated by linear interstices and crossed by numerous growth lines. Posterior ribs, about 16, very narrow, irregularly, weakly nodular, separated by wide, flat interstices, growth lines strongly marked.
Height, 6.5 mm.; length, 7 mm.; inflation, 2.6 mm.
Localities: Boulder Hill, near Dunedin, type; Wangaloa (Danian).
The sculpture though preserved on only a small part of the holotype is clearly enough shown to enable easy differentiation from other species. Consequently reconsideration of the type material seems to justify granting a name.
Nemocardium (Pratulum) semitectum Marwick.
1926. Nemocardium semitectum Marw., Trans. N.Z. Inst., vol. lvi, p. 312, pl. 72, fig. 8.
In the original description the statement about the ribbing needs correction. The diameter 22 mm. should read 12 mm., and the number of ribs should be 5 for medial ribs and 6 for anterior.
Locality: Tuffs, Lorne (Lower Kaiatan-Waiarekan).
Nemocardium (Pratulum) diversum Marwick.
1928. Nemocardium diversum Marw., Trans. N.Z. Inst., vol lviii, p. 472, fig. 85.
Locality: Tuffs, Waikaripi, Chatham Island.
The age of this species is not known, but the general affinities of the faunule accompanying it are with Eocene and Oligocene species in New Zealand.
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Nemocardium (Pratulum) quinarium n.sp. (Pl. 36, Figs. 10, 16.)
Shell small. Radial ribs rounded, very fine, medials 5 per mm. at 10 mm. from umbo; main ribs, about 70; interstices well marked, nearly as wide as ribs; concentric ridges well developed, closely placed. Posterior ribs, 32; narrow and high rounded, not tuberculate, connected across wide interspaces by strong transverse ridges, not crossing radials and not corresponding in adjacent interstices.
Height, 11 mm.; length, 12 mm.; inflation, 4 mm.
Localities: G.S. 1325, roadside just east of Mangatarehu Stream, Waikohu Surv. Dist. (type); G.S. 1369, 36 chains north-west of Trig. A, Waingaromia Surv. Dist.; also many other localities in Gisborne district. (Opoitian.) Many examples also in Opoitian beds in Wairoa Subdivision.
N. quinarium can be distinguished from pulchellum not only by the finer and more numerous ribs but also by the narrow interstices and the well developed transverse bars and absence of tubercles on the posterior area.
Nemocardium (Pratulum) finlayi Bartrum and Powell.
1928. Nemocardium finlayi Bart. & Pow., Trans. N.Z. Inst., vol. lix, p. 159, fig. 48.
Localities: Kaawa (type), (Opoitian); G.S., 1560, Waihua River, Hawke's Bay (? low Waitotaran).
Nemocardium (Pratulum) pulchellum (Gray). (Pl. 36, Figs. 12, 13, 20.)
1843. Cardium pulchellum Gray, Dieffenbach's N.Z., p. 252.
1913. Protocardia (Nemocardium) pulchella (Gray): Suter, Manual, p. 1000, pl. 62, fig. 9.
Localities: Recent, New Zealand, 10–120 faths. Numerous localities in Castlecliffian, Nukumaruan and Waitotaran beds. The species has been recorded from many localities in the Tutamoe Series (Marwick, 1931, p. 77), These should not have been identified so positively as many are no more than generic identifications based on poor material. None are from the typical Tutamoe beds of Muddy Creek, but all are from the upper part of the series as then used, and are probably Taranakian and higher. N. pulchellum does not seem to go below the Waitotaran.