XVII RUDIMENTARY VOCAL SACS 589 
In his teeth Man differs by the 
small exaggeration of the 
Fic. 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. 
mz, Maxilla ; pl, palatine ; p.max, premaxilla. 
Man.) 
(From Wiedersheim’s Structure of 
canines, which hardly, if at all, differ in the two sexes. There is 
also a complete absence of a diastema. 
The teeth are also on the whole 
weaker than in the Anthropoids, 
though Hylobates 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, kngwn to human anatomists 
as the ventricles of Morgagni, alone 
remain to testify to a former howl- 
Fic. 285.—Human Larynx in frontal 
section. cr, Cricoid cartilage ; s7, 
sinus of Morgagni; ¢.c, first 
tracheal cartilage; th, thyroid 
cartilage. (From Wiedersheim’s 
Structure of Man.) 
ing apparatus in the ancestors of Man. 
