Constant presence of the four tags indicates they may be permanent structures rather than temporary eversions or outrollings from the fissure. Slight depression of male porophores obviates protuberance beyond general level of body surface.

[…] taxed to its utmost to give even an approximate estimate of the number of young amateur astronomers and astronomeresses who are sitting up by twos these pleasant evenings to make sure that the brilliant stranger does not escape their observation, […]

Probably it was less painful to have white whelks than red carbuncles and bubukles.

We don't fully know what is going on. Right now we're just being drip-fed information.