然而，一些卵壳中会出现反向螺旋的蜗牛，多数情况下是在左旋卵壳中，右旋的出生率惊人地高。

However, some broods possess a few snails of the opposing hand, and in predominantly sinistral broods, the incidence of dextrality is surprisingly high.

指对医学软体动物卵的描述，包括卵的形状、大小、颜色、卵壳及其他特征。

Description of the medical mollusc egg, including egg shape, size, colour, egg shell.

冰冻切片的抗原也在第四周开始出现，定位在卵黄膜及卵壳上。

In the cryostat section, the antigens also appeared at the fourth week, they were localized on vitelline membrane and egg shell.