RUDIMENTARY VOCAL SACS 



589 



lu his teeth Man differs by the small exaggeration of the 



Fig. 284. — The hard palate, A, of a Caucasian; B, of a Negro ; C, of an adult Orang- 

 utan, showing the differences in shape of the bones. The palate of the Negro 

 represents a type transitional between that of the Caucasian and that of the Orang. 

 vix. Maxilla ; i^l, palatine ; jO.W(.r, premaxilla. (From Wiedersheim's Structure of 

 Man. ) 



canines, which hardly, if at all, differ in the two sexes 



also a complete absence of a diastema. 



The teeth are also on the whole 



weaker than in the Anthropoids, 



though Hylohates is very human in 



this particular. 



There is a tendency in Man 

 towards the disappearance of the 

 upper outer incisors, and more 

 markedly still of the wisdom teeth, 

 which appear very late, and are 

 often imperfect. In a large number 

 of cases the tooth does not appear 

 at all. In the larynx there is no 

 great development of the great 

 throat pouches of the Anthropoids. 

 The minute diverticula of that 

 organ, known to human anatomists 

 as the ventricles of Morgagni, alone 

 remain to testify to a former howl- 

 ing apparatus in the ancestors of Man. 



There is 



Fig. 285. — Human Larynx in frontal 

 section, cr, Cricoid cartilage ; sw, 

 sinus of Morgagni ; t.c, first 

 tracheal cartilage ; th, thyroid 

 cartilage. (From Wiedersheim's 

 Structure of Man.) 



