Note 195 — Chapter III · ENEMIES OF THE MOLLUSCA—MEANS OF DEFENCE—MIMICRY AND PROTECTIVE COLORATION—PARASITIC MOLLUSCA—COMMENSALISM—VARIATION
Reading edition
Phil. Trans. 1889, vol. 180 B, p. 207. A somewhat similar case (the celebrated Steinheim series of Planorbis) is dealt with by Hilgendorf, MB. Akad. Berl. 1866, p. 474; and Hyatt, Proc. Amer. Ass. Sc. xxix. p. 527.