-PROCEEDINGS OF SECTION F. 563 



Dr. Rogers was good enough to give me an opportunity of examining 

 •an aboriginal patient of his in hospital, and he pointed out the excessive 

 growth of hair on the body. I found the man's front teeth were crowded 

 together, and that an incisor was wanting. He stated that his mother 

 and aunts showed a similar condition, but not his father. (Figs. 9 and 

 10 are photographs of casts of the lower jaw made for me by Dr. 

 Crank.) 



The upper jaw of an infant presents an interesting condition. 

 The two maxillae have been split asunder, and the remains of the 

 maxillo-premaxillary sutures are perceptible, thus making evident an 

 abnormal condition of dentition. This consists in the presence of 

 a single cavity in each premaxillse, between the canine socket and the 

 intermaxillary suture. The cavities are similar, and each contains a 

 single large developing incisor, which has spUt transversely in such a 

 way as to give the appearance of one chisel-Hke incisor behind another. 

 An examination of the root shows the true nature of the condition. 

 On the right side, on the hngual border, there is an appearance that 

 suggests that there had been two milk incisors in the premaxillse. It 

 would be difficult to say what the condition had been on the left side. 

 On both sides the temporary molars have dropped out, and the bicuspids 

 are seen deeply embedded in the bone (Fig. 11). 



In the lower jaw the sockets of the two canines and four incisors 

 are seen in front of the first milk molars, which are still present. The 

 left lateral incisor socket is small. On the right side a permanent tooth 

 is seen emerging in a position occupying the places of the former canine 

 and lateral incisor. On the left side the jaw has been broken across, 

 and shows a tooth in a corresponding position very deep down in the 

 jaw — evidently a canine. Between this and the posterior surface of 

 the bone is a large tooth cavity, which communicates with the socket 

 ■of the lateral incisor. Funher examination would involve trephining 

 the bone, which I am loth to do until others have had an opportunity 

 of examining it in its present condition. 



In a specimen from an old adult subject there is a gap on the right 

 side, where the canine ought to be and probably was. Above the 

 lateral incisor, and projecting through the bone, is an apparently full- 

 sized tooth (Fig. 12). There is also another tooth embedded in this 

 maxilla and projecting on one side into the anterior part of the antrum 

 and on the other into the inferior meatus. The rest of the teeth 

 are normal. There would thus appear to be two extra incisors in this 

 right maxilla. The left seems to be normal. 



When examining a broken skull of a South Australian aboriginal 

 that I received some years ago, I found a peculiarity in the dentition. 

 On the left side the second and third molars would seem to have dis- 

 appeared some time before death. The first molar is turned inwards 

 (Fig. 13), so that the labial surface of the crown is horizontal, and this 

 surface has become worn smooth against the teeth of the lower jaw. 

 There is a similar dislocation of the corresponding tooth on the right 

 side, but to a very much less extent, and the molar behind it is not at 

 all displaced. All the teeth remaining in the jaw are much worn. 



