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(a) Key fauna of Lower Hutchinsonian.
Restricted forms:—
(M) None known as yet, the molluscs of this horizon being either very poorly preserved or but little collected.
(B) Pachymagas haasti Th., marshalli Th. (and similar large forms with primitive folding and cardinalia), Rhizothyris simple species (rare till true Hutchinsonian).
Tegulorhynchia antipoda Th. and aff. coelospina C. and C., Campages neozelanica Allan.
(Corals) Isis dactyla T.-W., Mopsea hamiltoni Th. (Isis has been found in the basal Ihungia—see Marwick, 1931B, p. 38.)
(F) Haeuslerella hectori, Victoriella aff. plecte (Chap.).
First appearance of:—
(M) None known as yet.
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(B) Pachymagas hectori Th. (as large forms; smaller ones in Waitakian and Duntroonian), Rhizothyris curiosa Th. (and other simple species), Terebratella aff. sanguinea Leach.
(F) Ehrenbergina d'Orb. (as marwicki), Büningia (as creeki), Vagocibicides typical (as maoria).
Siphotextularia awamoana (not common till Awamoan) and kreuzbergi, Spiroloculina rotundata Kreuz., Varginulina legumen L., Lingulina avellanoides (Kreuz.), Plectofrondicularia parri (in abundance), Bolivina cf. pusilla Schw. and lapsus (large and abundant), Rectobolivina maoriella, Uvigerina miozea, Siphogenerina rerensis and vesca, Cassidulina cf. carinata Cush., Amphistegina lessoni d'Orb. typical and abundant, Anomalina parvumbilia, Planulina cf. sinuosa Side. (extremely rare in Kaiatan), Globorotalia miozea.
Last appearance of:—
(M) Pleurotomaria Defr., Semitriton Cossm., Superstes F. and M.
(B) Liothyrella boehmi Th., Tegulorhynchia masoni Allan.
(F) Marginulinopsis Silv. (as n.sp.), Arenodosaria robusta (Stache), Notorotalia serrata, Discorbis turgidus.