Life in Tropical Seas--Portuguese Man-of-War--Its Structure--
Bladder--Tentacles--Poisoning Powers--Effects--Dr. Wallich’s
Objections--Gulf-stream--_Velellæ_--_Stephanomia_--Tongued
Sarsia--Its Swimming-bell--Locomotive Powers--Tentacles--
Forbes’s Æquorea--Luminosity--Crimson-ringed Aurelia--Its
Transformations--_Cydippe_--Poetical Description of it, 248-273