148 



PRIMATE ALVEOLINGUAL SALIVARY AREA 



times filling a triangular notch of the same. In all these forms, how- 

 ever, the greater sublingual duct is intermediate between the submax- 

 illary duct and the lesser sublingual glands. The variant Chimpanzee 



above figured and described 

 presents the only instance 

 in the primate series ex- 

 amined in which the regular 

 topographical order of the 

 three intermandibular glan- 

 dular components appears 

 changed and in which the 

 greater sublingual gland oc- 

 cupies the lateral position, 

 its duct crossing lateromesad 

 the cephalic margin of the 

 intermediate lesser subun- 

 gual group to its point of 

 union with the main sub- 

 maxillary duct. 



The plan of development 

 of this variation may be 

 schematically indicated on 

 the left side of Fig. 23, 

 Part IV. The occurrence 

 in an individual of a primate 

 genus normally conforming 

 to the usual primate type is 

 a strong argument in favor 

 of the hj-pothetical genetic 

 interpretation of interman- 

 dibular sahvary structures 

 here adopted. 



{b) The second observa- 

 tion within this general 

 primate group which deserves special consideration concerns the speci- 

 men of A teles shown in Fig. 11, Part III and schematically in Fig. 24, 

 Part IV. Tliis animal is an extremely valuable link in the entire 





So 00° Jo 000 



Q OV^ 







I. 



I'. 

 I" 



2. 



3- 



Fig. 23. 

 Submaxillary gland and duct. 

 Secondary submaxillary gland and duct. 

 Accessory submaxillary gland and duct. 

 Greater sublingual gland. 

 Lesser sublingual glands. 



