NECK GLANDS OF THE MARSUPIALIA. 359 



A section parallel to the transverse axis of the outer 

 lobe showed two distinct organs. The inner smaller 

 portion had all the characters of a thymus gland, except 

 that cortical and medullary portions were not distinct. A 

 few Hassan's corpuscles could be seen. This portion 

 of the gland, which is evidently the cervical thymus lobe, 

 was enclosed in the same sheath as the outer portion. 

 The latter was a salivary gland. A few alveoli are repre- 

 sented in fig. 3 (3). It is evidently a mixed gland, contain- 





h ■,-:■■ 



$ 







■i . {y .., '"^J^ 





1 













•-> , 





' yy*J'' 



Y 



*: / 



3 





Fig. 3. Acrobates, portions of the salivary glands— 1, lower lobe of 

 submaxillary ; 2, parotid ; 3, upper lobe of submaxillary. 



ing serous and mucous alveoli. The former are composed 

 of cells, staining deeply, and with the nuclei about the 

 centre of the cell. The latter are made up of cells 

 staining lightly, and with the nuclei crowded round the 

 lumen. The characters of the underlying lobes are repre- 

 sented in (1). The alveoli are larger, and as a rule their 

 lumina were wider. The nuclei were near the external 

 surfaces. Marginal or ''crescent" cells were present, 

 and some of the alveoli had the character of the darkly 



