HAIRLESS DUIKER AND DOG, AND BULLDOG-HEADED CALF. 239 



of the fore-limb ai^e remarkable, in that the outer hoof of each 

 foot had curved upwards and grown into about a quarter of 

 a circle with a chord of nearly three inches. The inner hoof 

 of each fore-limb is normal. The formation of such abnormal 

 hoofs is known in sheep, oxen, etc., and has been attributed 

 in certain cases to damp ground and the absence of wear under 

 artificial conditions. In the present case, however, the con- 

 ditions were as nearly natural as possible ; also, the other 

 duikers kept under the same conditions did not exhibit the 

 peculiarity ; and further, the character developed symmetri- 

 cally, and only in the outer hoofs of the fore-limbs. 



There was an obvious tendeucy for pronounced growth of 

 hoofs, as those of the fetlocks are larger than usual. 



Correlated with the unusual development of hoofs, the horns 

 are abnormal. The right horn measures 5'5 in. in length. 

 Roland Ward gives 5*5 in. as the record, and it should be 

 remembered that the present animal is four-fifths smaller than 

 an ordinary duiker. Tlie usual length is about 3|- in. The 

 horn is smoother than a typical one ; one or two rings are 

 only faintly marked towards the base, and the longitudinal 

 striation, which is strongly marked in the normal horn, is here 

 but slightly developed. The circumference of the horn at the 

 base was a little less than normal. 



The distal third of the left horn is bent backwards, as if 

 through injury in early life. 



We thus see that in the epidermal organs, the skin, hair, 

 hoofs and horns, this animal was strikingly abnormal. 



In the sixth offspring of the same parentage, which lived 

 only twelve months, and was supposed to die of sunstroke and 

 not of any obvious disease or accident, quite similar abnor- 

 malities were present ; but they were not quite so strongly 

 marked. The skin was black, but perhaps a little paler on 

 the ventral sui'face. Hair was much more abundant than in 

 the above described ram. 



The unborn ewe of about seven months presented a pig- 

 mented skin on the dorsal surface of the body and head, and 

 also on the sides ; while the ventral surface was not pig- 



