J. F. Rigby

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The configuration (21 4), considered by Klein, Burnside, Coxeter and others, is realized by points and lines in the real projective plane. A configuration (n k) is a family of n points and n lines such that each of the points is incident with precisely k of the lines, and each of the lines is incident with precisely k of the points. Configurations (« 3)(More)
Ediea homevalensis H. Nishida, Kudo, Pigg & Rigby gen. et sp. nov. is proposed for permineralized pollen-bearing structures from the Late Permian Homevale Station locality of the Bowen Basin, Queensland, Australia. The taxon represents unisexual fertile shoots bearing helically arranged leaves on a central axis. The more apical leaves are fertile(More)
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