DEVELOPMENT OF SALIVARY GLANDS IN THE DOMESTIC CAT 307 



ular plane as contrasted with the roof, and is accordingly the major 

 component of the cheek. Caudad the alveobuccal sulci converge 

 towards the orbital anlage. Here the buccal sulcus has been reduced 

 in the formation of the orbital inclusion, and a new lateral border 

 acquired by the marginal cavity, the secondary buccal sulcus. This 

 becomes continuous with the superior alveobuccal sulcus (Figs. 164, 

 165, la and 25). The orbital inclusion, therefore, corresponds to the 



28* 



Schema of buccal sulcus together with the alveobuccal and alveolabial 

 sulci, intermediate stage. 



I. 

 la. 

 lb. 



2. 



7- 



Buccal sulcus. 12. 



Secondary buccal sulcus. 16. 



Subparotid sulcus. 25. 



Angidus oris. 26. 



Orbital inclusion, pars lata. 28. 



Orbital inclusion, pars cylindrica. 280 



Parotid anlage. 

 Orbitoparotid bridge. 

 Superior alveobuccal sulcus. 

 Inferior alveobuccal sulcus. 

 Inferior alveolabial sulcus. 

 Superior alveolabial sulcus. 



7j. Masseter muscle. 



dorsal Wangenstreifen on the roof of the mouth precisely, so far as the 

 dorsal lamina of its fold is concerned. The ventral alveobuccal sulcus 

 disappears near the border of the masseter. It is, therefore, impossible 

 to make so precise an evaluation of the ventral lamina of the inclu- 

 sion, in terms of the ventral Wangenstreifen. The subparotid con- 

 densation in the mesenchyme is lateral to the inferior alveobuccal 

 sulcus ; in early stages it extends caudad to the inclusion, and hes imme- 



