Plate XCIX 



Fig. 1. Transverse coronal section through the Ungual crossing of the left side 

 of a cat embryo of 14 millimeters. Columbia Collection, No. 122. 

 Slide 10, row 2, section i, X 115, reduced 5. 



Fig. 2. Transverse coronal section through the anlage of the subma.xillary gland 

 of the left side of a pig embryo of 1 5 millimeters. Princeton Collection, 

 No. 211. Slide 6, row i, section i. This section is 120 /x caudal to 

 the Ungual crossing, X 115, reduced ',. 



Fig. 3. Transverse coronal section through the anlages of the submaxiUary and 

 sublingualis major of the left side of a pig embryo of 15 millimeters. 

 Princeton CoUection, No. 2 lo. Slide 6, row 3, section i. This section 

 is 150/U caudal to the lingual crossing, X 115, reduced 5. 



Fig. 4. Transverse coronal section through the anlages of the submaxiUary and 

 sublingualis major of the left side of a pig embryo of 16 millimeters. 

 Princeton Collection, No. 217. Slide 7, row i, section 6. This section 

 is 60 fx caudal to the lingual crossing, X 115, reduced 5. 



1. Alveolingual region. 



2. Circumlingual space. 

 J. Marginal cavity. 



4. Lingual sulcus. 



5. .\lveolar sulcus. 



6. Submaxillary llange. 



7. Subma.xillary proliferation, keel or duct. 

 II. Sublingualis major. 



72. Supralingual sulcus. .\ furrow present in embryos of 17 millimeters 

 and over, parallel and dorsal to the lingual sulcus, at first caudal to the 

 lingual nerve, later extending craniad. 



14. Lingual nerve. 



75. Subma,xiUary ganglion. 



16. Hypoglossal nerve. 



ly. Meckel's cartUage. 



/(?. Palate process. 



iQ. Tongue. 



