198 EVOLUTION AND DISEASE. 
instance there was a clearly defined bony prominence 
over the infraorbital ridge of each maxillary bone; the 
skin in each case was freely movable over the abnormal 
outgrowth. The ages of the men were 38, 18, and 20. 
years. The prominences had existed as long as the 
men could remember, and caused them no inconvenience 
(fig. 106). 
