Most of the larger Medusæ of our coasts belong to another order,
including those which have covered eyes, and some other peculiarities,
chiefly connected with reproduction. The _Lucernariæ_, which I have
already noticed, formerly associated with the Anemones, are now united
with this order. A very familiar example we may see in our harbours
and tidal rivers in summer, the common Crimson-ringed Jelly-fish.[130]
It is a hemisphere of colourless jelly, some six or eight inches in
diameter, which is usually well marked by four imperfect rings of
purplish crimson--the reproductive organs--seen through the transparent
flesh. The radiating vessels are often tinged with the same colour.
[Illustration: