. Bulletin of the British Museum (Natural History), Geology. 218 H. G. OWEN (Eosonneratia) vnigri Savel'ev) with subgenus Globosonneratia Savel'ev 19736 (Type species Sonneratia perinflata Breistroffer); Pseudosonneratia Spath 1925a (Type species Pseudo- sonneratia typica Spath) with subgenus Isohoplites Casey 1954 (Type species Parahoplites stein- matini Jacob); Tetrahoplites Casey 1952 (Type species Sonneratia subquadrata Sinzow); Protohoplites Spath 1923 (Type species Ammonites archiacianus d'Orbigny) with subgenus Hemisonneratia Casey 1952 (Type species Ammonites puzosianus d'Orbigny); and
. Bulletin of the British Museum (Natural History), Geology. 218 H. G. OWEN (Eosonneratia) vnigri Savel'ev) with subgenus Globosonneratia Savel'ev 19736 (Type species Sonneratia perinflata Breistroffer); Pseudosonneratia Spath 1925a (Type species Pseudo- sonneratia typica Spath) with subgenus Isohoplites Casey 1954 (Type species Parahoplites stein- matini Jacob); Tetrahoplites Casey 1952 (Type species Sonneratia subquadrata Sinzow); Protohoplites Spath 1923 (Type species Ammonites archiacianus d'Orbigny) with subgenus Hemisonneratia Casey 1952 (Type species Ammonites puzosianus d'Orbigny); and Otohoplites Steinmann 1925 (Type species Ammonites raulinianus d'Orbigny). The interrelationships of these genera are shown diagrammatically in Fig. 44. The Sonneratiinae, as interpreted here, is wholly of mammillatum Superzone age and is monophyletic with Sonneratia (Globosonneratia) as its earliest member. Its sutural pattern Subzones. (regularis) Fig. 44 Interrelationships of shell morphology in the various form genera and subgenera of the Sonneratiinae and their links with the Hoplitinae and Gastroplitinae. A-Anahoplitoides, T~Tetrahoplites, P. (P.)-Protohoplites (Protohoplites), P. (H.)-Protohoplites (Hemisonneratia). 1. Development of globular shells. 2. Development of compressed forms with ribbing projected forward ventrally accompanied by some effacement along the siphonal line. 3. Development of compressed discoidal forms with strong projection of the ribbing forward onto the venter and a tendency to effacement along the siphonal line. 4. Total effacement of the ribbing along the siphonal line, lateral instability of the rib endings to form an en-echelon arrangement across the venter with tuberculation and lautiform ribbing. Depressed subquadrate forms from Sonneratia; laterally compressed forms from Pseudo- sonneratia via Anahoplitoides - 4'. 5-6. Secondary development of Otohoplites through Tetrahoplites - Protohoplites (Hemisonneratia) and Protohoplites (Protohopli
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