PRIMATE ALVEOLINGUAL SALIVARY AREA 

 I. II. III. IV. V. VI. Vll. VIII. 



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B ® @ (2) ® ® 



c ® (D @ ® ® 



129 



E ® (D 



F ® (2) 



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X 



G ® 

 H ® 



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It will be seen that this principle leads to final adult conditions 

 which at first sight appear to differ radically 

 from each other in type, number and extent 

 of the definite permanent glands, while the 

 actual difference in organization depends upon 

 relatively slight changes in the selection and 

 adaptation of the individual components within 

 the same available framework. This phylo- 

 genetic factor is of such importance in the 

 analysis of individual types and of variants 

 that it warrants some further detailed illus- 

 tration. 



In Figs, -ja and 76 the glands are arranged 

 in four latero-mesal districts, a, b, c, and d. 



I. A lateral group of single glands (a) with 

 separate individual orifices, derived by uniform 



