中文摘要：

描述藏南岗巴地区白垩系宗山组产出的两种固着蛤Bournonia haydeni Douville，1916，Bournonia tibeticn DOUVille，1916，并据化石材料和野外观察的资料，讨论其功能形态特征。根据生活习性，固着蛤的生态类型可被分为三种：直立型（elevators），附着型（clingers）和侧卧型（recumbents）。Bournonia tibetica属于直立型，Bournonia haydeni属于附着型。

英文摘要：

Abundant rudists occur in the late Cretaceous Zongshan Formation at Gamba, in southern Xizang. Previous researchers have recorded four genera and seven species. The authors went to Gamba to collect and survey the geological profile in 2009, one genus and two species were identified. Bournonia haydeni Douville and Bournonia tibetica Douville. On the basis of their mode of life habit, rudist morphotypes can be divided into three function groups, elevators, clingers and recumbents. Bournonia tibetica belongs to elevators, and Bournonia haydeni to clingers.