作者：崔贵海

摘要：A skull of Tritylodontoid was collected from Lufeng, Yunnan Province by Yuan Zuyin and the author in 1972. The specimen was found at Zhang-jiawan, in Lower Lufeng Formation from which Lufengia had been discovered (Chow and Hu, 1959). The present skull here described was weathered and damaged. It is 74.6mm. in length and with a diastema 15.2mm. long. There are seven cheek teeth on each side. In view of the structures of the skull, it is doubtless a member of Tritylodontoid and by its special characters, the present author considers it as a new form of the group and names it as Dianzhongia longirostrata gen. et sp. nov.
    The diagnosis of Dianzhongia is as follows:
    Only a couple incisors. Jugal comparatively strong and not extending outwards judging by its remaining basal part. Diastema long. Upper cheek teeth with two outer, three median, and two inner cusps.
    The geological age of the Dianzhongia-bearing deposits is probably of Lias Stage.

卷期：19卷 01期

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