Kalentera marwickin. sp. is figured and described. The holotype and other specimens are from beds of the Otapirian Stage (Rhaetian) near Awakino, south-west Auckland, and a number of specimens that seem conspecific are recorded from beds of the same age further north near Marakopa and Kawhia as well as in the Kaihiku Range, while the species is found together withMonotis calrataof the Warepan Stage (Norian) near Marakopa. The form appears to be morphologically as well as stratigraphically intermediate between the Aratauran (Hettangian-Sinemurian) genotypeK. mackayiMarwick and the Otamitan (upper Carnian)Triapborus zealandicus(Trechmann) from which it probably developed. It is postulated that members of the family formed part of the vagrant benthos in or on a shallow silty relatively flat sea-floor.