HAIRLESS DUIKEK AND DOG, AND BULLDOG-HEADED GALE. 235 



On a Black, Hairless Duiker and Dog, and a 

 Bulldog-Headed Calf. 



By 

 Ernest Warren, D.Sc.Ixond. 



With Plates X— XIII, and Text-fignre. 



The abnormalities about to be described are striking 

 examples of those curious sports or large variations which 

 occur in a spontaneous manner, and to which we are at 

 present quite vinable to assign any definite cause. In all 

 three cases the same abnormality occurred more than once, 

 and the fact of this recurrence adds considerably to the 

 interest of the observations. 



In June, 1910, Mr. Alick P. Martens, who resides on his 

 farm at Table ^lountain some ten miles from Pietermaritzburg, 

 brought to the Museum an eviscerated specimen of a rather 

 small, but apparently mature, male duiker [Cephalophus 

 grimrai (Linn.)']. It was remarkable in the skin being black, 

 and mostly devoid of hair. Normally the skin of the common 

 duiker is white, and the hair is speckled yellow and brown, 

 but there is considerable variation in the general colour of 

 the coat. 



The black specimen was born of parents that lived in an 

 enclosure on the farm, and it seemed quite healthy, and was 

 supposed to have been killed by a dog. The next offspring 

 produced by the same parents had also a black skin and was 

 a male, but there was considerably more hair than in the 

 first case. The animal appeared delicate, and lived only 

 twelve months, dying, so it was assumed, of sun-stroke. The 

 ewe by the same ram then produced a normal offspring. 



