CHAP, xm.] DIGITS: CAT. 321 



external to the normal nail. The innermost digit has two pha- 

 langes, and is formed like a normal pollex, excepting that its claw 

 was very deep and looked as if it were formed from the germs of 

 two claws united and curving concentrically. The carpus as 

 regards number of elements was normal, but the trapezium and 

 trapezoid were both of rather large size, and the pollex articulated 

 partly with the trapezium but chiefly with the downward process 

 on the radial side of the scapho-lunar. [This approaches Condition 

 IV of the manus, but in it the external of the two united digits is 

 only represented by the minute extra nail.] 



Left pes. Six digits, each having three phalanges. The three 

 outer digits were formed as left digits, but the three inner digits 

 were shaped like right digits. The internal cuneiform is double 

 the normal size, but is not divided into two pieces. It bears the 

 two internal digits, of which the innermost is ankylosed to it. 

 [Condition IV of the pes.] Compare Fig. 87, II. 



Right pes. Same as the left, except for the fact that the two 

 internal digits are completely united in their metacarpals and first 

 phalanges, and the cuneiform series consists of four bones, two of 

 which correspond to the internal cuneiform of double size described 

 in the left foot. (Compare Fig. 85, I, c 1 and c 2 .) [Condition IV of 

 the pes, save for the union of the metacarpals of the two internal 

 digits.] 



475. Kitten belonging to Mr Poulton's strain (see No. 480) and 

 kindly lent by him to me for examination. The specimen was 

 very young and the carpus and tarsus were not dissected. 



Left manus. Six digits, all with three phalanges. The two 

 internal digits are separated by a space from the others so as 

 to form a sort of lobe. The claw of the innermost digit is re- 

 tracted on the top of the second phalanx and not to the side, 

 so that this digit is not differentiated either as a right or a left. 

 The next digit is a right and the four external digits (II, III, 

 IV and V) are normal lefts. [Condition III of manus.] 



Right manus. Same as left. 



Left pes. Same as left pes of No. 474 [sc. Condition IV of 

 the pes]. 



Right pes : same as the left [Condition IV of the pes]. 



476. Cat having its extremities abnormal, the property of the 

 Oxford University Museum and kindly lent for examination; 

 bones only preserved. 



Right pes. Like the left pes of No. 474, but c 1 not separated 

 from c*. [Condition IV of pes.] 



Left pes. Like the right, but c 1 separate from c 2 . [Condition 

 IV of pes.] 



Right manus. The four external digits II V normal. The 

 double digit like that of No. 472. The innermost digit with three 

 B. 21 



