DepartmentofPalaeontology,TheNaturalHistoryMuseum,CromwellRoad,LondonSW75BP,U.K.andSchoolofEarthandEnvironmentalSciences,UniversityofGreenwich,ChathamMaritimeCampus,Chatham,KentME44AW,U.K.;
InstitutdeGeologie,UniversitedeFribourg,CH-1700Fribourg,Switzerland.;
OxfordUniversityMuseumofNaturalHistory,ParksRoad,OxfordOXI3PW,U.K.;
ResearchSchoolofGeologicalandGeophysicalSciences,BirkbeckCollegeandUniversityCollegeLondon,GowerStreet,LondonWCIE6BT,U.K.;