1905.] 



ON HORN-GROWTH IN A CASTRATED PRONGBUCK. 



191 



or abortive nodular growths in, the antlers, due to complete, or 

 incomplete, castration ; also two Red Deer skulls (Cervus elaphus), 

 showing congenital absence, or modification in the growth, of the 

 antlers. 



The following papers were read ; 



1. The Effects of Castration on the Horns of a Prongbuck 

 {Antilocapra americana). By R. I. POCOCK, F.L.S., 

 F.Z.S., Superintendent of the Gardens. 



[Received Feljruary 21, 1905.1 



(Text-figiu-es 28 & 29.) 



The Zoological Gardens recently i-eceived on deposit an adult 

 male Prongbuck remarkable for the abnormal development of the 

 horns, which, instead of rising vertically from the forehead, curve 

 from the root boldly forwards, then downwards, then backwards, 

 like a pair of teapot-handles, each ending in a slightly incui-ved 

 point close beneath the eye (text-fig. 28). There also appears at 

 first sight to be no trace of the anterior tine or prong characteristic 

 of the normal horn. 



Text-fig. 28. 



Lateral view of head of a castrated Prongbuck, showing the abnormal growth and 

 shape of the horns. 



A writer in the ' Field,' on February 4th, commenting on the 

 Proc. Zool. Soc— 1905, Vol. I. No. XIII. 13 



