|Lone bubble shell, Haminoea japonica. Belly view, through glass.|
|Two bubble shells. The one in back has been following the other's slime trail from the far side of the tank, and is about to catch up.|
|At last! And the two slipped under the sand together, to indulge in their favourite pastime.|
These snails are hermaphroditic; at each mating, one takes on the male role, the other acts as the female. The next time round, they may switch. And both are capable of laying eggs.
|Their second favourite pastime. Laying eggs.|
The eggs are expelled through a genital pore just behind the head. Each yellow egg is encased in a tramsparent jelly capsule, that is just barely visible in these photos.
|As she lays the eggs, she curls away, leaving a crescent shaped jelly mass glued to whatever surface she has chosen (in this case the front glass wall of the tank.)|
I'd never seen a bubble snail's mouth before; it's usually completely shrouded by the head shield and the lower foot.
The eggs should hatch in about a month. Unfortunately for the bubble's plans of conquest, the infants don't survive in the tank. They're probably swept up by the pump within hours of hatching.