tor Kumpera and Vlastimil Wagner, of Sao Paulo, 

 Brazil. 



The cross sections of the jaws of diodontids, showing 

 the trituration plates and teeth of the biting edge, all 

 were skillfully cut and polished by Edgar R. Lawrence, 

 dental surgeon of West Chester, Pa. 



More generally, Helga 0. Kumpera was a mainspring 

 in the laborious mechanism leading to the completion of 

 this monograph, as the culmination of a 20-year study. 

 Her help ran the gamut from the typing of hundreds of 

 pages of manuscript to translating into English numer- 

 ous articles in several foreign languages, and from thou- 

 sands of hours spent in stippling illustrations to equally 

 numerous hours spent in proofreading. 



The following colleagues have generously provided 

 specimens for examination or made available data about 

 or assistance with specimens in their care, and their vital 

 help is greatly appreciated (affiliations listed as of the 

 time the help was rendered, and therefore sometimes 

 outdated at this time): Tokiharu Abe, Tokaiku Fish- 

 eries Research Laboratory, Tokyo; B. Accordi, Istituto di 

 Geologia e Paleontologia dell'Universita di Roma; Gerald 

 R. Allen and John E. Randall, Bernice P. Bishop 

 Museum, Honolulu; Roberto D. Andreucci, Escola 

 Paulista de Medicina, Sao Paulo; James E. and Ethyl H. 

 Atz, Gareth J. Nelson, Donn E. Rosen, Bobb Schaeffer, 

 and C. Lavett Smith, American Museum of Natural 

 History, New York; Reeve M. Bailey and Teruyo Uyeno, 

 University of Michigan, Ann Arbor; Keith E. Banister, 

 P. Humphrey Greenwood, Alison Longbottom, Rosemary 

 McConnell, G. Palmer, Colin Patterson, Ethelwynn 

 Trewavas, Charlotte Welch, and Peter J. Whitehead, 

 British Museum (Natural History), London; M. L. 

 Bauchot, M. Blanc, Jacques Blot, and J. Guibe, 

 Museum National d'Histoire Naturelle, Paris; Frederick 

 H. Berry, National Marine Fisheries Service, Miami; E. 

 Bertelsen, Marinebiologisk Laboratorium, Charlotten- 

 lund Slot; M. Boeseman and G.F. Mees, Rijksmuseum 

 van Natuurlijke Historic, Leiden; James E. Bohlke, 

 Charles C. G. Chaplin, and Neal R. Foster, Academy of 

 Natural Sciences of Philadelphia; Niels Bonde, Mineral- 

 ogisk-Geologisk Institut, K(/benhavn; Margaret G. Brad- 

 bury, San Francisco State College; Heraldo A. Britski, 

 Museu de Zoologia da Universidade de Sao Paulo; 

 Harvey R. Bullis, Jr., and Richard A. Waller, National 

 Marine Fisheries Service, Miami and Washington, D.C.; 

 Vernon E. Brock, Warren E. Burgess, and William A. 

 Gosline, University of Hawaii, Honolulu; Jean Cadenat, 

 Institute Frangais d'Afrique Noire, Gofee, Senegal; 

 David K. Caldwell, University of Florida, St. Augustine; 

 Edgar Casier, Institut Royal des Sciences Naturelles de 

 Belgiques, Brusselles; William Chan, Fisheries Research 

 Station, Aberdeen, Hong Kong; Edward Chin, Richard 

 L. Haedrich, and Andrew Konnerth, Woods Hole 

 Oceanographic Institution, Woods Hole, Mass.; Eugenie 

 Clark, University of Maryland, College Park; Glenn H. 

 Clemmer and Royal D. Suttkus, Tulane University, New 

 Orleans; Daniel M. Cohen and Bruce B. Collette, 

 National Systematics Laboratory, National Marine 

 Fisheries Service, Washington, D.C.; Walter R. 



Courtenay, Florida Atlantic University, Boca Raton; 

 Giambattista Dal Piaz, Istituto di Geologia, Paleon- 

 tologia e Geologia Applicata dell'Universita di Padova; 

 William P. Davis, Aquatic Sciences, Inc., Boca Raton; 

 L. F. de Beaufort, H. Nijssen, and P. J. H. van Bree, 

 Zoologisches Museum, Amsterdam; KurtDeckert, Hum- 

 boldt Universitat, Berlin; Thomas Devany, C. Richard 

 Robins, and David G. Smith, University of Miami; Hugh 

 H. DeWitt, University of Maine, Walpole; Myvanwy M. 

 Dick, Alfred S. Romer, and Tyson R. Roberts, Museum 

 of Comparative Zoology, Cambridge; Pedro Duarte 

 Bello, Universidad de La Habana; Alfred W. Ebeling, 

 University of California, Santa Barbara; Paul R. Ehrlich 

 and Donald Kennedy, Stanford University; Donald S. 

 Erdman, Department of Agriculture, San Juan, Puerto 

 Rico; William N. Eschmeyer, W. I. FoUett, Warren C. 

 Freihofer, George S. Myers, and Pearl M. Sonoda, 

 California Academy of Sciences, San Francisco; H. Adair 

 Fehlmann and Leslie W. Knapp, Smithsonian Oceano- 

 graphic Sorting Center, Washington, D.C.; P. Four- 

 manoir. Centre Office de la Recherche Scientifique et 

 Technique Outre-Mer, Paris; A. J. Fraser and R. J. 

 McKay, Western Australian Museum, Perth; A. Fraser- 

 Brunner and John C. Marr, Food and Agriculture 

 Organization of the United Nations, Rome; K. C. 

 George, Central Marine Fisheries Research Substation, 

 Kerala; Robert R. Gibbs, Edgar N. Gramblin, Robert H. 

 Kanazawa, Ernest A. Lachner, Leonard P. Schultz, Vic- 

 tor G. Springer, William R. Taylor, and Stanley H. 

 Weitzman, National Museum of Natural History, 

 Washington, D.C.; Carter R. Gilbert, University of 

 Florida, Gainesville; J. R. Grindley, South African 

 Museum, Cape Town; Bruce W. Halstead, World Life 

 Research Institute, Colton, Calif.; Carl L. Hubbs, John 

 E. McCosker, and Richard H. Rosenblatt, Scripps 

 Institution of Oceanography; J. Jenny, Naturwissen- 

 schaftliche Sammlungen des Kantons Glarus; Robert S. 

 Jones, College of Guam, Agana; S. Jones, Central 

 Marine Fisheries Research Institute, Mandapam Camp, 

 India; Paul Kahsbauer, Naturhistorisches Museum, 

 Wien; Toshiji Kamohara, Kochi University; Wolfgang 

 Klausewitz, Natur-Museum und Forschungs-Institute, 

 Frankfurt; Adolf Kotthaus, Biologische Anstalt 

 Helgoland, Hamburg; Richard J. Kresja, California 

 State Polytechnic College, San Louis Obispo; Louis A. 

 Krumholz, University of Louisville; V. M. Makushok 

 and T. S. Rass, Institute of Oceanology, Academy of 

 Sciences of the U.S.S.R., Moscow; E. Marchal, Centre 

 de Recherches Oceanographiques, Abidjan; G. E. Maul, 

 Museu Municipal do Funchal; Giles W. Mead, Los 

 Angeles County Museum of Natural History; A. G. K. 

 Menon, Zoological Survey of India, Calcutta; Robert V. 

 Miller, National Marine Fisheries Service, Washington, 

 D.C.; Martin A. Moe, Oceanographic Mariculture In- 

 dustries, Riviera Beach, Fla.; Donald Moore, National 

 Marine Fisheries Service, Galveston; Basil Nafpaktitis, 

 University of California, Los Angeles; J(/rgen Nielsen, 

 Universitetets Zoologiske Museum, K<rt)enhavn; Ross F. 

 Nigrelli, New York Zoological Society, Brooklyn; John R. 

 Paxton, Frank H. Talbot, and Gilbert P. Whitley, 



