Note 71 — Chapter III

I have ventured to devote some considerable space to the development of the pond-snail, and for an obvious reason, that of making it perfectly clear to my readers that my microscopical investigations of Limnœa, made in 1853, were published in the “Journal of the Microscopical Society,” June, 1854, and republished in extenso in the several editions of this book, dating from the last mentioned period. Nevertheless, the fringe of cilia was, it appears, rediscovered in 1874, just twenty years after my paper was published. It is almost unnecessary to add that Carpenter gravely errs in his statement “that the existence of the fringe of cilia in the embryo snail had been overlooked until 1874.”