diagnoses of the species not previously described are now given to allow citation of their names in the text of the foregoing paper. The holotypes of the new species are in the New Zealand Geological Survey, Lower Hutt (catalogue numbers with prefix: TM). Inoceramus matotorus n.sp. (Plate 23, Fig. 1) 1956. Inoceramus sp. M: Wellman, XX Congr. geol. internac. Mexico, Resumenes: 352. A large species of Inoceramus generally found only as fragments, so that its shape is not well known. Shell up to 10 mm thick, but much thinner near the beak. Fairly well inflated when young, but shell flattening and even becoming concave near the ventral margin when adult. Concentric ribs weak and irregular, obsolete in adult part of shell. Shell structure of overlapping prismatic layers that project as frills on the exterior of shell. The overlapping layers are best seen in cross section of the shell. The sculpture and shell-cross-section-structure are diagnostic. Holotype. Height 210 mm, shell thickness 2 mm. GS1604, lower part of Ihungia Stream, Mata Survey District. Coll. M. Ongley, 1922 (HM2110). Distribution. Northland, Raukumara Peninsula, Wairarapa, Marlborough, Canterbury (Amuri Bluff, and Trelissick Basin). About ten localities known. Age and Affinities. Haumurian Stage (Maestrichtian). No overseas affinities known. Inoceramus nukeus n.sp. (Plate 23, Fig. 2). 1917. Inoceramus sp. Woods, N.Z. geol. Surv. Pal. Bull. 4, pl. 14, figs. 3, 4. 1928 Inoceramus glatziae Fleg.; Heinz, Min. geol. Staatstinst, Heft 10: 126 (not of Fleg.). 1955 Inoceramus sp. A. Wellman, Trans. roy. Soc. N.Z., 83: 96. 1956 Inoceramus sp. N, Wellman, XX Congr. geol. internac. Mexico, Resumenes: 352. Shell small, almost equivalve, winged, less variable than most species, rather short and rounded. Anterior flank steep, retracted, with obsolete sculpture, meeting disc at an angle to form a sharp carina on internal moulds that is often sharpened by compaction. Two orders of concentric ribs; the large irregular, distant, steep sided especially on their ventral sides, more pronounced on inside than on outside of shell; the small more regular, 5 or 6 to each of the larger ribs. In well preserved specimens fine radial threads show on both interior and exterior of shell. Often they are not exactly normal to the concentric ribs. The structure and shape are diagnostic in good specimens, but poor material can be confused with I. hakarius. Holotype. Height c. 58 mm; length c. 41 mm; inflation c. 24 mm. GS6427. Waimata River, Tautane Survey District, Wairarapa. Coll. M. Ongley (TM2111). Distribution. Northland, Raukumara Peninsula, Wairarapa, and Marlborough. About 30 localities known. Age and Affinities. Upper part of Teratan Stage (Santonian to Campanian). Perhaps related to the European Inoceramus lobatus Goldfuss. Inoceramus opetius n.sp. (Plate 23, Fig. 3). 1955. Inoceramus sp. B, Wellman, Trans. roy. Soc. N.Z. 83: 104. 1956. Inoceramus sp. O, Wellman, XX Congr. geol. internac. Mexico, Resumenes: 352. An abundant, gregarious, but very variable species. Medium to large, thin-shelled, mytiliform to rounded shovel shaped. Concentric ribs poorly to moderately developed and irregular, tending to cross the centre of the disc with a large radius of curvature and to climb steeply, crowded at anterior and posterior margins. Ribs low, rounded, with interspaces