PRIMATE ALVEOLINGUAL SALIVARY AREA 154 a 



of development and differentiation to which the submaxillary genetic 

 Hne has been carried. 



The human variants which may be classed under this group are 

 represented by the individuals shown in Figs. 7 and 9, Part I, and in 

 schemata 32 and 33, Part IV. They are characterized by the ventral 



Fig. 3s. Schema of adult human alveolingual salivary complex (Part I, Fig. 9). 

 /. Submaxillary gland and duct. 

 /'. Secondary subma.xillary gland and duct. 

 J. Lesser sublingual glands, 

 j'. Isthmian glands. 

 4- Weber's gland. 



position of the secondary submaxillary gland (/') and the relatively 

 short course of its duct. 



It is also noteworthy that the human variants representing this 

 primate group (Figs. 7 and 9, Part I, schemata Figs. 32, 7,7,, Part IV) 

 present, in addition to the secondary and accessory subma.xillary 

 glands, an extensive development of the lesser sublingual field, which 

 extends beneath the terminal portion of the subma.xillary duct along 

 the mesal margin of the latter. The dropping out of the complex of 

 the separate greater subHngual gland and duct seems, therefore, as 

 would be e.xpected, to be met by selective greater development both 

 in the lesser sublingual group and along the submaxillary genetic line. 



