113
194 Lobsters are occasionally found with two symmetrical claws: which are then usually serrated, sometimes (but very rarely) both blunt-toothed. Cf. Calman, P.Z.S. 1906, pp. 633, 634, and reff.
114
195 Wilson, E. B., Reversal of Symmetry in Alpheus heterochelis, Biol. Bull. IV, p. 197, 1903.
115
196 J. Exp. Zool. VII, p. 457, 1909.
116
197 Biologica, III, p. 161, June. 1913.
CHAPTER IV ON THE INTERNAL FORM AND STRUCTURE OF THE CELL
1
198 Anatomical and Pathological Observations, p. 3, 1845; Anatomical Memoirs, II, p. 392, 1868.