434 SUPPLEMENT ON CIRROPODA. 
Each of these little sacs enclosed an embryo, which per- 
fectly resembled the adult animal. ‘The latter does not ap- 
pear to differ from other species of balani. It fixes itself, in 
preference, in the furrows of the chest, and near the pectoral 
fins of the balena boops, L. Its whiteness, similar to that of 
ivory, causes it to be easily recognized by the whale-fishers. 
It withdraws promptly into its shell when it perceives the 
harpoon, and produces on the skin of the whale a sensation, 
which, in the opinion of Fabricius, may serve to give it timely 
warning of the danger with which it is menaced. If this 
observation, made by an eye witness, be exact, we cannot 
help thinking it somewhat singular, that an animal provided 
with good eyes should be warned more tardily of the approach 
of a body, than one which possesses no means of information 
but from the touch alone. 
