chap, xiil] digits : cat. 323 



Left pes. Digits V, IV, III normal lefts. The next internally 

 (II) is a three-phalanged digit formed as a right. The next is 

 a thick three-phalanged digit with a partially double nail and 

 double pad. This is not differentiated as either right or left. 

 The innermost digit is a two-phalanged hallux-like digit, not 

 differentiated as right or left. [Not conforming to any condition 

 in my scheme.] 



Right pes. The same as the left except that the digit II is 

 only slightly differentiated as a left. The next has a double nail, 

 and the innermost is hallux-like as described for the other foot. 

 [Not conforming to any condition of my scheme.] 



Right manus. As in No. 472. "Pollex" with two phalanges. 

 [Condition IV of the manus.] 



Left manus. Same as right, but the " pollex ' : is only repre- 

 sented by a single bone not differentiated or divided into meta- 

 carpal and phalanges and bearing no claw. [Approaches Condition 

 IV of the manus.] 



479. Cat. A left pes bearing abnormal digits. The digits II, III, 

 IV and V are normal and are true left digits. Internal to these 

 are two metatarsals which are united centrally and peripherally 

 but are separate in their middle parts. These two metatarsals by 

 their common distal end bear amorphous phalanges belonging to 

 three digits. There are two large claws and one rudimentary one. 

 [For details the specimen must be seen.] The navicular bone is 

 divided into two distinct bones, of which one carries the external 

 cuneiform and a small cuneiform for the digit II, the metatarsal of 

 which is rather slender and compressed in its proximal part. The 

 internal part of the navicular bone bears two cuneiforms, one for 

 each part of the united metatarsals. The digits borne by these 

 metatarsals are so misshapen that it is not possible to say anything 

 as to their symmetry. Mus. Coll. Surg., Terat, Catal., No. 306 A. 

 [This specimen does not conform to any of the Conditions of 

 my scheme.] 



*480. In the case of the Cat the polydactyle condition has been observed 

 by Poulton (Nature, xxix. 1883, p. 20, figs. ; ibid., XXXV. 1887, p. 38, 

 figs.) to recur frequently in the same strain. A female cat had six toes 

 on both fore and hind feet. The mother of this cat had an abnormal 

 number of toes not recorded. The grandmother and great-grandmother 

 were normal. Two of the kittens of the 6-toed cat had seven toes both 

 on the fore and hind feet [no 7-toed pes among specimens examined 1 »y 

 me]. Many families produced by the 6-toed cat, and among them only 

 two kittens with 7 toes on all feet, but between this and the normal 

 numerous varieties seen. The abnormality is not in all cases sym- 

 metrical on the two sides of the body. The pads of the different toes 

 are sometimes compounded together. In some cases an extra pad was 

 present on the hind foot behind and interior to the central pad. The 

 second pad was sometimes distinct from the central pad and sometimes 

 was united with it. [From the figures it appears that the secondary 



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