SALIVARY GLANDS IN M.AHSUPIALS, INSECTIVORES, RODENTS 319 



4. The greater sublingual gland (2) forms a small mass embedded 

 in the cephalic margin of the submaxillary. 



The submaxillary and greater sublingual ducts run closely connected, 

 under cover of lingual nerve and lesser sublingual glands, to separate 

 orifices on the parafrenular papilla. 



5. The lesser sublingual glands (j) form a relatively large mass 

 which begins some distance behind the orifices of the submaxillary and 

 greater sublingual ducts and extends caudad to abut directly against 

 the body of the greater subUngual gland. The glands are character- 

 ized by unusually large and distinct openings of their ducts on the 

 lesser subhngual (Rivinian) ridge. Further, the caudal extremity 

 of the gland mass turns dorsomesad, so that the submaxillary and 

 greater sublingual ducts, crossed in this situation by the lingual 

 nerve, lie for a short distance after emerging from their respective 

 glands on the lateral aspect of the lesser sublingual mass. They 

 then turn over the oral border of the same to its mesal surface, which 

 they follow forward in the rest of its extent. Their terminal seg- 

 ments, as stated, pass forward beyond the lesser sublingual mass to 

 their separate orifices. 



Fig. 7. Hydrochcerus Capyb.ara — C.\PYB.AR.-i. 

 Princeton University Morphological Museum, No. 1025. 



1. The parotid (5) is in the form of an inverted T, the extremity of 

 the vertical branch fitting around the circumference of the external 

 auditory meatus. The expanded horizontal portion hes in the sub- 

 and retro-mandibular region, its cephalic division supporting the sub- 

 ma.xillary gland from below. The large intraglandular divisions of the 

 parotid duct run, for the most part, on the superficial aspect of 

 the gland, ascending to a point on the cephalic margin of the vertical 

 segment of the gland from which the main duct emerges, on a level 

 with the external auditory meatus. Stenson's duct (5) runs, without 

 lateral derivatives, straight across the masseter muscle to its 

 termination. 



2. The submaxillary gland (/) is relativel)' small and rests on the 

 cephalic division of the horizontal parotid arm. An accessory sub- 

 maxillary gland (/"), close to the main body of the gland, empties into 

 the beginning of the suljmaxillary duct. The latter is simple, its ter- 



