Note 442 — LETTER XXII.
Reading edition
Mr. W. S. MacLeay, where quoted above, objects to this term; but as the organs in question are generally given to the animal to assist in its motions, and have been universally regarded as a kind of legs, it was judged best for the sake of distinction to give them a different name from perfect legs, and at the same time one that showed some affinity to them.