3l8 SALIV.AJRY GLANDS IN MARSITIALS, INSECTIVORES, RODENTS 



right side of Fig. 4 by division and reflection of the right cephalohumeral 

 muscle. 



RODENTIA 



Fig. 5. SciURUS Carolinensis — Gray Squirrel. 

 Columbia University jNIorphological Museum, No. 1946. 



1. The parotid (5), the largest single gland, extends from the mas- 

 seteric region to the supraclavicular fossa. Its caudal margin rests 

 on the cephalic border of the pectoralis major. 



2. The submaxillary gland (/) is a globular mass embedded, at 

 the hyoid level, in the mesal border of the parotid. 



3. The greater sublingual gland is placed between the cephalo- 

 lateral pole of the submaxillary and the adjacent cephalomesal sur- 

 face of the parotid. The course of the submaxillary (i) and greater 

 sublingual (2) ducts to the plica sublingualis is shown on the left side 

 of Fig. 5, after reflection of the mylohyoid. 



4. A small group of lesser sublingual glands (j) covers the lateral 

 aspect of the terminals of the submaxillary and greater sublingual ducts. 



5. Lateral to the symphysis a small collection of inferior alveo- 

 buccal glands (7) is encountered. 



Fig. 6. Ccelogenys P.\ca — Paca. 



Princeton University Morphological Museum, No. 1305. 



1. Parotid gland (5). A compact irregularly quadrangular mass 

 fitted closely around the ventral and cephalic margins of the external 

 ear. Stenson's duct, emerging from the upper third of the cephalic 

 border, curves under cover of the zygomatic arch to its buccal orifice. 



2. Immediately cephalad of the parotid duct terminal lies a separate' 

 small oblong gland {4) with relatively long duct {4 a). In Fig. 6 the zy- 

 gomatic arch has been detached and reflected to show this structure, 

 which I have not encountered in this condition in any other mammal. 

 It is evidently a derivative of the superior alveobuccal series of the 

 usua! mammalian type, but characterized by combination of the 

 individual components into a definite gland with a common duct. 



3. Submaxillary gland (/). A compact globular mass situated in 

 the digastric space, its border slightly overlapped by the adjacent 

 angle of the parotid. 



