Description of an Experimental Class within the Globigerinidae (Foraminifera)—2

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Abstract
Globigerinidae with multiple apertures found in Miocene samples from Oamaru and Clifden, Southland, are described in terms of the degree to with the nth chamber envelops earlier chambers, the height of the primary and one of the supplementary apertures, the number of chambers and apertures per specimen, and direction of chamber coiling. Measured characters show patterns of continuous variation within the class studied. This emphasises the arbitrary character of the “central types” used by Blow to describe the morphological changes in the lineage leading to Orbulina and suggests that simple statistical measures may better express these trends.