Abstract: A nest of hypsilophodontid eggs was collected from the Djadokhta Formation, Bayan Manduhu„ Inner Mongolia Autonomous Region by one of us (Li Rong) in autumn of 1990. This is the first discovery of this type of eggs in China. The first well-documented hypsilophodontid egg was described by Horner and Weishampel in 1988 and by Hirsch and Quinn in 1990 as Orodromeus makelai based on the eggs containing identifiable embryonic skeletons found in the Upper Cretaceous (Campanian) Two Medicine Formation of western Montana, North America. The present paper describes and illustrates these fossil eggshells found in Bayan Manduhu by polarizing light microscopy (PLM) and scanning electron microscopy (SEM).

摘要： 本文记述的恐龙蛋化石标本，采自内蒙古乌拉特后旗巴音满都呼上白垩统牙道黑达组中。蛋化石在蛋窝中排列的方式和蛋壳的显微结构特征与北美发现的含有可鉴定为棱齿龙胚胎骨骼的蛋化石基本相似，但还有一些差别，如蛋壳外表面不具纵向细纹，柱状层中鱼骨型纹饰不明显等。因此，应为棱齿龙科中另一新的属种代表。