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figures and 2 tables
CLARK A M
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abbreviations Ammonites appear Aptian Australiceras authors bearing becomes BMNH body chamber branches Campanian Cape Casey Clark close coiling collected Collignon consists constrictions Cretaceous crozier described Description designated developed diameter differs Discussion distal distinct dorsal dorsum early Family female figures flanks fossil genus given gonothecae height Helicancyloceras holotype hydrothecae illustrations included indicated initial inner internode Island known late lateral length lobe locality Lower Aptian margin material metres Mozambique nematothecae Note occur original ornament plates present Pseudophyllites recorded referred region relatively ribs rounded segment separated seta shaft shoulder side similar single slightly South African Museum southern Spath species specimen spines stages stem suture synonym Table Tetragonites text-fig third Tonohamites Toxoceratoides Tropaeum tubercles umbilical Upper venter ventral wall whorl section wide Zululand