150 PRIMATE ALVEOLINGUAL SALIVARY AREA 



3. The secondary submaxillary gland (/'). 



4. The greater sublingual gland (2). 



The fifth component of the alveolingual field, the lesser sublingual 

 group (j) is well developed, extending, as the most lateral element, 

 from the pUca sublingualis caudad nearly to the lingual nerve. The 

 plan of development of these conditions is schematically indicated on 

 the right side of Fig. 23, Part IV. 



III. The third general group of primate intermandibular glands 

 comprises those forms in which the intermediate glandula sublinguahs 

 major (Bartholini) defaults, so that the complex contains only two 



Fig. 25. Schema of alveolingual salivary complex of N ydipithccus trmrgatus . 

 (Part III, Fig. 8) and Lemur mongoz (Part III, Fig. 13). 

 /. Submaxillary gland and duct. 

 J. Lesser sublingual glands. 



distinct components, viz. the medial submaxillary gland and duct, 

 with or without accessory and secondary subma.xillary elements, and 

 the lateral series of the separate lesser (Rivinian) subhngual glands. 



Three minor subdivisions of this general group may be recognized : 



A. Forms in which the submaxillary duct is simple, without either 

 accessory or secondary submaxillary additions. 



In the present series the type is illustrated by Nyctipitheciis trivir- 

 gatus (Fig. 8, Part III, and schema Fig. 25, Part IV) and Lemur 

 mongoz (Fig. 13, Part III), and its genetic derivation is shown in the 

 left side of schematic Fig. 26, Part IV. 



In N ycti pilhecus (Fig. 8, Part III) both parotid and main submax- 

 illary gland appear enlarged far beyond the limits usually observed in 

 primates. The two multilobar submaxillary glands are in touch with 



