BRITISH AVONIAN CONODONT FAUNAS 277 
(1) Systematic palaeontology 
The total fauna described includes some 25,000 identifiable specimens, referable to 
167 species. These are described and illustrated, and their precise stratigraphical 
ranges recorded. Two new named genera, 40 new species and 13 new subspecies 
are recognized. 
(j) Detailed lithological sections and abundance figures are included for each part of 
the succession. Range charts are also provided. 
VIII ACKNOWLEDGMENTS 
We are deeply indebted to our colleagues in the Geology Department, University 
College of Swansea, for help and advice during the course of this study. Mr. T. R. 
Owen has given us the benefit of his extensive knowledge of the Avonian rocks of 
South Wales, and has been a particular help to us in planning our collecting in that 
area. Mr. Brian Simpson has assisted us with various aspects of the technical work 
involved in the study. We owe a particular debt of gratitude to Mrs. Shirley 
Osborn and Mr. Michael Reynolds, for their patient help in rock processing, to Miss 
Sonia Kostromin for her enormous secretarial help, to Mr. Stanley Osborn for his 
skilful photography, to Mrs. Greir Lewis and Mrs Beryl Fisher who have prepared 
the text-figures, to Miss Rhiannon Watkins for typing, and to Miss Veronica Arlen 
and Mr. H. A. H. McKee for their editorial help. 
We have been greatly helped by the generous advice of a large number of friends 
in various countries, who have willingly discussed problems of systematics and 
correlation with us, and have in some cases provided topotype material for com- 
parison. We particularly wish to thank Dr. Gunther Bischoff of Gewerkshaft 
Elwerath Erdolwerke, Hannover, Dr. Charles W. Collinson of the Illinois Geological 
Survey, Dr. Raphael Conil of the Catholic University of Louvain, Professor Brian F. 
Glenister of the University of Iowa, Professor F. Hodson of Southampton University, 
Dr. John Huddle of the U.S.G.S., Washington, Dr. Huw Jenkins of Sydney Univer- 
sity, Dr. Gilbert Klapper of Pan American Petroleum Corporation, Tulsa, Oklahoma, 
Dr. M. Lys of the Institut Francais du Pétrole, Dr. S. C. Matthews of the University 
of Bristol, Dr. Klaus-Dieter Meischner, of the University of Gottingen, Dr. D. Moore 
of Southampton University, Dr. Carl Rexroad of the Indiana Geological Survey, 
Dr. James W. Scatterday of the State University of New York at Geneseo, Dr. 
Trevor Walker of Long Beach College, California, Mr. R. B. Wilson of the I.G.S., 
Edinburgh, and Dr. Wilh Ziegler of the Geologisches Landesamt Nordrhein-West- 
falen. 
We are also grateful for the financial support which made this study possible. 
The Department of Scientific and Industrial Research, and its successor, the Science 
Research Council, made a grant to F. H. T. Rhodes, to support a programme of 
research, of which this study forms a major part. This grant provided support for 
E. C. Druce, and R. L. Austin received a D.S.I.R. Studentship. We are also grateful 
for the support in the form of accommodation, apparatus, materials and technical 
help provided by the University College of Swansea. 
