322 SALIVARY GLANDS IN MARSUPIALS, INSECTIVORES, RODENTS 



2. The submaxillary gland (i) is composed of several large loosely 

 connected lobes, and the greater sublingual gland (2) is embedded on its 

 cephalolateral surface. Submaxillary (/) and greater subhngual (2) 

 ducts take the usual course and terminate in independent parafrenular 

 openings. 



3. The lesser sublingual glands (j) form a solid rectangular mass 

 with very distinct individual duct openings on the Rivinian ridge. 



UNGULATA 



The t>-pical Ungulates are characterized by the following features 

 in their salivary organization : — 



1. Only two of the three components of the typical mammalian 

 alveolingual area are fully developed, as the submaxillary and lesser 

 sublingual glands. 



The greater subhngual or Bartholinian gland is usually absent. 

 On the other hand, the lesser sublingual group is extensively developed. 



2. The submaxillary gland is large and prolonged dorsocephalad, 

 under cover of the parotid, from its usual submandibular position into 

 the retromandibular and subauricular area. 



3. Stenson's duct emerges from the ventrocaudal portion of the 

 gland and arches below masseter and mandibular angle, or under 

 cover of the latter and of the internal pterygoid, to the ventral border 

 of the masseter, along which it ascends to its point of intersection 

 with the deep facial vein and the facial nerve trunks, where it turns 

 at right angles through the buccinator libers to its terminal orifice. 



These generalized Ungulate salivary characters are illustrated in 

 the following three preparations : — 



Fig. II. Antelope Cervic.apra — .\ntelope. 

 Princeton University jVIorphological Museum, No. 1463. 



I. The trapezoid parotid gland (5) is slightly prolonged at the 

 caudoventral angle upon the emerging duct. The latter curves 

 along the border of the masseter and mandible, ascends along the 

 ventral margin of the muscle, and turns above the commissure at 

 right angles to its terminal segment through buccinator and alveo- 

 buccal mucosa (5). 



