NO. 1495. 



OBSERVATIONS ON ORANG SKULLS— HRDLICKA. 



559 



in one the rij^lit third lower molar seems to be permanently wanting. 

 Among the 12 males and 10 females with full second dentition the 

 conditions are as follows: 



Dentition. 



a No. 142181. 



bNo. 142199 (upper right); No. 142195 (upper left); No. 142180 (lower both sides); No. 142198 (lower 

 left); No. 142199 (lower left); No. 142170 (lower right): No. 142190 (lower right). 

 « No. 142199. 

 dNo. 142181. 



The fifth molar in No. 142199, a full}- adult male, is of large size, 

 but onl}' about half erupted (tig. 6), so that it shows at the same time 

 an example of late dentition. The supernumerarv tooth in No. 142181 

 (tig. 7) is situated ventrally and in apposition to the regular canine, 

 touching also the lateral incisor. It is not as large as the canine 

 proper, but is decidedly broader and higher than any of the incisors. 

 The left side of the lower jaw, which contains this tooth, is longer 

 than the right, which renders the front of the bone asymmetric (the 

 right side of this jaw presents a crowding of the premolars and an 

 absence of the third molar, though there is not a lack of space for this 

 last). Selenka found" in his collection dental anomalies of the follow- 

 ing varieties and [)roportions: 



Dental anomalies. 



Fourth molar below on right side in 



Fourth molar below on left side in 



Fo\irth molar below on both side.s in 



Fourtii molar above on right side in 



Fourth molar above on left side in 



Fourth moliir above on both sides in 



Fourtli molar above cm left ami below on right side in 



Fourth molar above on left and below on both .sides in 



Fourth molar above on right and below on both sides in 



Fourth molar above on both sides and below on left side in . 



Fourth molar above and below on both sides in 



Five molars on each side above with 4 on each side below in 



Total of cases 



Besides the above, Selenka observed three supernumerary premolars 

 (two above in one skull, one below), and one supernumerarv incisor 

 (details not given). Extra molars, it is seen from ])oth series, pre- 

 dominate in males and in the lower jaw, where the teeth in general 

 show a greater development. In No. ] 12198 of Doctor Abbott's series 

 the fourth lower molar is rudimentary (fig. 8). 



Menscheiiaffen, pp. 90-91. 



