62 EDWARD A. WILSON. 



In the skull of this young specimen the most prominent teeth in the upper jaw- 

 are the two incisors on each side, and they are almost twice the size of the correspond- 

 ing teeth in an adult female. The third or outermost incisor only just shows through 

 the gum, and this is one of the permanent set, for just anterior to its emerging point 

 on each side may be seen the small socket for the deciduous tooth closed over by the 

 gum. When this was opened up by dissection, a minute third incisor of the milk 

 dentition was found embedded in it. There are therefore on each side three incisors of 

 the milk dentition in the upper jaw, the two central being larger than those which 

 follow of the permanent set, and the third minute. The canines of the milk dentition 

 are next in prominence to the incisors. Each of these has a long conical crown 

 extending 10 mm. beyond the gum, straight and pointed. Next to these, and towards 

 the median line, if the gum is dissected away, the points of the permanent canines 

 can be disclosed. 



The first pre-molar is the largest and most prominent tooth in the upper jaw. 

 Next to it comes a tooth, the point of which has but just pierced through the gum. The 

 third is more advanced ; the fourth, again, is just showing through the gum ; the fifth 

 post-canine, or first molar, shows two of its three cusps, the central and the posterior, 

 through the gum, and the second molar was completely hidden in the gum, until 

 disclosed by dissection. All these are teeth of the permanent dentition, the cheek 

 teeth of the milk dentition, mere caps of dentine in the surface of the gum, having 

 dropped from their hold in the lower jaw, though some of them still remain in situ 

 in the upper jaw. As to their number no definite statement can be made from 

 the specimen, though the position of the few that remain makes it probable that 

 there are four pre-molars in either jaw. In the lower jaw again, when compared 

 with the lower jaw of a young adult, tlie inner tooth of the two incisors of the 

 milk dentition is considerably larger than the permanent tooth which follows it ; in 

 shape and character the inner of the two deciduous incisors is almost the exact 

 counterpart of the outer of the two permanent incisors, whereas the outer of the two 

 deciduous incisors is much like a small edition of the permanent canine. The inner of 

 the two permanent incisors again is a small and insignificant tooth resembling neither 

 of the deciduous incisors. The canine tooth of the milk dentition is in situ on each 

 side in the lower jaw, and has a long and pointed cylindrical crown 8 mm. in length. 

 Just within and slightly behind it can be found deeply imbedded in the gum the point 

 of the permanent canine. Behind this is the most prominent tooth in the lower jaw, 

 the first permanent pre-molar with a large central and a minute anterior cusp. Just 

 behind it can be seen two minute sockets in the gum from which the small deciduous 

 teeth have quite recently fallen. Posterior to these the central cusps of the second, 

 third and fourth pre-molars are just appearing through the gum. On the outer side of 

 the fourth on the right side is a small depression for a milk tooth recently lost, and on 

 the left side this milk tooth is in situ. The central cusp of the single lower molar is 

 just beneath the surface of the gum. 



