PHYSOPHORID A. I4I 
attention, and has been described under many names. Sailors call 
it the sea-bladder, from its resemblance to that organ; it is also 
known as the Portuguese man-of-war, from its fancied resemblance to 
a small ship as it floats along under its tiny sail. Naturalists after 
Eschscholtz call it Physalia utriculus, from the Greek word, gvoaais, 
Se 
Fig. 48.— Offensive apparatus of Physophora hydrostatica. 
a bubble, and w/ricu/us from its stinging powers. It was long thought 
that the Physalia was an isolated individual. But, according to 
recent researches, it forms, like the species already described, an 
animal republic. ; : 
Let us imagine a great cylindrical bladder dilated in the middle, 
attenuated and rounded at its two extremities, of eleven or twelve 
