Australian Middle Cambrian molluscs: corrections and additions

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Abstract
The Cambrian Monoplacophora Anabarella, Mellopegma and Stenotheca were incorrectly referred to the Family Procarinariidae Wenz 1938 by Runnegar & Jell (1976) because Horný (1964a) has shown that Procarinaria is a bivalve. A new family, Stenothecidae, is therefore proposed. Also, two genera of Cambrian pelagiellids described by Horný (1964b) were omitted from a discussion of the family in Runnegar & Jell (1976). Information which has been obtained since 1976 shows that the snorkel of Yochelcionella cyrano was much longer than previously thought, that Yochelcionella occurs in Pennsylvania as well as Australia, that the Ordovician and Silurian microfossils Janospira and Jinoncella may be related to Yochelcionella, and that Runnegar & Jell were probably correct in referring all bellerophont univalves to the Monoplacophora, rather than to the Gastropoda where they have been traditionally placed.