. Bulletin of the British Museum (Natural History), Geology. BRYOZOANS FROM UPPER CRETACEOUS OF ALBERTA, CANADA 23. Fig. 15 Villicharixa ongleyi (Brown), BMNH D36532, holotype, [probably L. Pleistocene, Petane Limestone], Petane, New Zealand; compare with V. lintonensis (Figs 13-14). Scanning electron micrographs of uncoated specimen. 15A, autozooids, some with 'regenerations', x 54; 15B, two autozooids showing numerous small spine bases around the opesiae, x 120. (middle Maastrichtian); localities near Linton, North Dakota, (Cuffey et al., 1981: 401-2). It is also possible that the bry
. Bulletin of the British Museum (Natural History), Geology. BRYOZOANS FROM UPPER CRETACEOUS OF ALBERTA, CANADA 23. Fig. 15 Villicharixa ongleyi (Brown), BMNH D36532, holotype, [probably L. Pleistocene, Petane Limestone], Petane, New Zealand; compare with V. lintonensis (Figs 13-14). Scanning electron micrographs of uncoated specimen. 15A, autozooids, some with 'regenerations', x 54; 15B, two autozooids showing numerous small spine bases around the opesiae, x 120. (middle Maastrichtian); localities near Linton, North Dakota, (Cuffey et al., 1981: 401-2). It is also possible that the bryozoan listed from the Fox Hills Sand- stone (lower to middle Maastrichtian) in southern Alberta (Sanderson 1931: 1254; Allan & Sanderson 1945: 79) may represent Villicharixa lintonensis rather than Eokotosokum bicystosum, as noted above (p. 21). Acknowledgements. Cliff and Kurt Cuffey provided assistance dur- ing fieldwork. Participants in the Blackfoot Annual Pow-wow at Browning, Montana are thanked for linguistic help. We are grateful to Janet Waddington (Royal Ontario Museum, Toronto) and to Fred Collier and Don Dean (National Museum of Natural History, Washington) for arranging loans of specimens. REFERENCES \llan, & Sanderson, 1945. Geology of Red Deer and Rosebud Sheets, Alberta. Report, Research Council of Alberta, Edmonton, 13: 1-115. Arthur, & Schlanger, 1979. Cretaceous oceanic anoxic events' as causal factors in the development of reef-reservoircd giant oil fields. Bulletin of the American Association of Petroleum Geologists, Chicago, 63: 870-885. , Scholle, , Pollastro, , Barker, & Claypool, 19X1 Gcochemical and scdimentologic indicators of depositional environments and diagenetic trends in the Niobrara Formation (Upper Cretaceous). Colorado and Kansas. Abstracts with Programs, Geological Society of America, Boulder, 13 (7): 398-399. Barron, & Peterson, 1989. Model simulation of the Cretaceo
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