SALIVARY GLANDS IN MARSUPIALS, INSECTIVORES, RODENTS 32I 



2. The submaxillary (/) and greater sublingual (2) glands occupy 

 the digastric area, below and behind the mylohyoid. Their simple 

 ducts run forward in company, under cover of the lesser sublingual 

 mass, to separate parafrenular openings. 



3. The lesser sublinguals (j) occupy the central and caudal districts 

 of the lateral alveohngual field as a compact trapezoid mass. 



Fig. q. Fiber Zibethicus — Muskrat. 

 Princeton University Morphological Museum, No. 460. 



1. The parotid (jiz, 56) is elongated in the cephalo-caudal direction 

 and partially subdivided by a deep vertical groove along the ectal sur- 

 face. -In the interval between its concave cephalic border and the ven- 

 tral margin of the external auditory canal is lodged the globular gland 

 of the eyeHd (6) , whose duct (6a) ascends obliquely cephalad over the 

 zygomatic area and carries near its termination two accessory para- 

 ductular gland masses. The parotid duct (5) is simple, without asso- 

 ciate derivatives. 



2. The submaxillary gland (la, ib) is single, almond shaped, lodged 

 in the suprahyoid region near the median line, the glands of opposite 

 sides being nearly in contact. 



3. The cephahc pole of each submaxillary gland is capped dorsally 

 by a lymph node (/o), intervening between it and the adjacent parotid, 

 and ventrally by the small, but distinct, greater sublingual gland (2). 



Submaxillary and greater sublingual ducts (/, 2) are simple, extend 

 around the mylohyoid border to the mesal surface of the lesser 

 sublingual mass, and terminate by separate parafrenular orifices. 



4. The lesser sublingual glands (j) form a compact mass, with taper- 

 ing cephahc extremity, occupying the central and caudal portions of the 

 lateral alveolingual district, and covering in the area of their extent 

 the lateral aspect of the submaxillary and greater sublingual ducts. 



Fig. 10. Arctomys Monax — Ground Hog. 

 Princeton University Morphological Museum, No. 886. 



I. The parotid (5), extremely reduced in the dorso-ventral and 

 correspondingly elongated in the cephalo-caudal diameter, forms a long, 

 narrow mass, extending from the caudal border of the external audi- 

 tory meatus to the submaxillary fossa. The parotid duct (5) is simple 

 and runs a long course over the masseter to its buccal orifice. 



