688 



DR. E. LONNBERG OS THE 



[June 19» 



Kg.1. 



B. 



c. 



Schematic sketches showing different stages of development of the horn of 

 the Musk-ox. A, represents the horn at the end of the first summer; 

 B, an intermediate stage when the exostoses are at the height of their 

 development ; and C, a quite full-grown horn. 



