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Comments are given on the classification of the Cretaceous heteromorphy ammonoid family Nostoceratidae. A new genus is proposed to accommodate a distinct group of species, which is similar to Turrilit...oides in the mode of coiling and ribbing but has the apertural part of the body－chamber facing obliquely upward. This is probably ancestral to Didymoceras and several other genera, occupying a fundamental stock in the. family in parallel with Hyphantoceras. Thus two major lines of descent may be distinguished in the Nostoceratidae.show more
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18_02_p331