Note 9 — Chapter II · THE METEORS OF THE SEA.
Reading edition
Page 15. Pleurobrachia rhodactyla, Agassiz. This is one of the numerous free-swimming marine animals, belonging to the Ctenophores. A group of the sea-jellies which have the pretty rows of paddles adown their long diameter. They are usually about a pigeon’s-egg in size, are oval, and in their element almost invisible, so colorless and transparent are they. A close inspection shows the paddles to be iridescent.