@inbook {7161,
	title = {Functional morphology of the Class Helcionelloida nov., and the early evolution of the Mollusca},
	booktitle = {The early evolution of Metazoa and the significance of problematic taxa. Proceedings of an international Sypmosium held at the University of Camerino 27-31 March 1989},
	year = {1991},
	note = {296 pages total},
	pages = {157-177},
	publisher = {Cambridge University Press},
	organization = {Cambridge University Press},
	address = {Cambridge},
	keywords = {bivalvia, cambrian, cephalopoda, evolution, gastropoda, helcionellidae, mollusca, monoplacophora, paleontology, rostroconchia, scaphopoda},
	isbn = {0 521 40242 5},
	author = {Peel, John S.},
	editor = {Simonetta, Alberto M. and Conway Morris, Simon}
}
