The East Indies have long been renowned as a source of profuse and beautifully preserved Middle Jurassic ammonites. The fossil localities are widely scattered. from the Sula Islands in the west to New Guinea in the east and Timor-Roti in the south . Their faunas have been extensively described. and the older accounts were critically reviewed by ARKEL(L1 956). By far the most important collection came from two principal areas: the island of Taliabu in the Sula Islands of the northern Moluccas in Indonesia. described by BOEHM(1 912) and KRUIZING(1A9 26). and various localities around Geelvink Bay in north-western Irian Jaya. in the western part of the island of New Guinea. described by BOEHM(1 913) and VISSER& HERME(S19 62) .

Монография   посвящена    палеобиологическому изучению   макроцефалитид.

На основании морфологических признаков и -онтогенетического изучения маркоцефалитид намечается направление их филогенетического развития. Приводятся новые данные об экологии данной группы животных. Даны подробные диагнозы родов данного семейства. Кроме систематики, экологии и эволюции в работе освещены вопросы стратиграфического значения макроцефалитид