88 SALIVARY GLANDS OF LOWER PRIMATES 



meatus to the labial commissure, and entirely enveloping the mas- 

 seteric segment of Stenson's duct, which presents a short intramural 

 segment. 



No preparation could more clearly illustrate the potential character 

 of the primate parotid duct in the sense of giving origin to extensive 

 secondary or accessory parotid derivatives. 



Usually the potential capacity of the gland duct is limited in its 

 actual results to the production of so-called "socise" or "accessory" 

 parotid elements, such as are illustrated in Part I by Figs. 3, 6, 7, 9. 

 But in the present instance the entire masseteric course of the 

 typical duct of Stenson is covered by a paraductular glandular 

 efflorescence which carries the physiological activity of the parotid 

 gland up to the premasseteric engagement of the duct in the buccina- 

 tor muscle. It would be very easy to deduce from tliis adult parotid 

 complex, by exaggeration of certain components, and ehmination 

 of the remaining accessory parotid elements surrounding the main 

 duct, conditions which explain the formation of the parotid complex of 

 Hyrax, of Gulo, and, to a lesser degree, of Procyon. Considering, how- 

 ever, our present lack of correct and detailed information concerning 

 the ontogeny of these forms, it seems more fitting to accept these 

 adult X.ypt'i as individual morphological conditions which may even- 

 tually be brought, by proper ontogenetic evidence, into hne with the 

 adult salivary organization of forms very far removed in the generally 

 accepted zoological scale. 



B. SUBMANDIBULAR COMPLEX (.-) 



(a) Submaxillary gland. — i. The main submaxillary gland (/) is 

 located entirely in the submandibular recess below and beliind the 

 mylohyoid (/o). 



2. Above the mylohyoid is lodged a large secondary submaxillary 

 gland (/'), whose separate duct follows along the dorsal border of the 

 main submaxillary duct and unites with the same about midway be- 

 tween the intersection with the lingual ner\-e and the plica subungualis. 

 The large resulting common canal (7) is joined near its termination 

 by the greater sublingual duct (2) and opens on the plica by a single 

 orifice common to all three glands (main submaxillary, secondary sub- 

 maxillary, and sublingual glands). 



