上颌的一个表皮硬骨，在前颌骨的后面。

A dermal bone of the upper jaw which lies posterior to the premaxillary.

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咬合必须是下颌突出式咬合，就是说，下颌的门牙必须比上颌的门牙向前突出一些。

Jaws must be undershot. The incisors of the lower jaw should protrude over the upper incisors.

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我们拥有的是上颌的尖端，这是一种叫做前颌骨的骨头；还有一个保藏在牙槽里的、破碎的牙齿。

All we have is the tip of the upper jaws -bones called the premaxillae, and a broken tooth preserved in one socket, "said Dr Martill."

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