IN 1883 I contributed an article to NATURE (vol. xxix. p. 20) upon this subject, giving an account of my observations from 1879 up to the date at which the paper was written. The last observation was concerned with a family of four male tabby kittens, all of which possessed the abnormality to a very marked extent. This was the first family produced by a female tabby (and slight tortoiseshell) cat which, when born, was the most abnormal form which had come under my notice, possessing two extra toes on all the paws, i.e. seven on each fore-paw and six on each hind-paw. The right paws of this cat were figured in the “paper referred to, together with the corresponding paws of a normal cat, for comparison. These figures are now reproduced in order to illustrate the present paper. I quote the description of the figures from the previous paper.” It is seen that the extra toes (in the fore-feet) are those labelled A and B (in Figs. 1 and 2), and they confer the extraordinary breadth upon the foot. The most recently added is B, which is still partially coalesced with A, and has but one pad in common with it (Fig. 2).... There is seen to be an extra pad behind the additional toes, of which there is no trace in the normal foot. In some families to be described, and also in two previously noted, the large extra to e, A, is present, while the insignificant pollex (Fig. 1, 1) is absent, and thus the paw appears extremely broad, although with only, the normal number of toes. In the hind-paws (Figs. 5 and 6) “there is little doubt that the innermost toe 1 is the hallux lost in the normal foot.... The second extra toe is that labelled A... On the under side (Fig. 6) all the toes have separate pads, and there is an additional pad behind the extra toes,” which is sometimes fused with that behind the normal toes.