Plate C 



Fig. 5. Transverse coronal section through the anlages of the submaxillar}- and 

 sublingualis major of the left side of a pig embryo of 17 millimeters. 

 Princeton Collection, No. 167. Slide 10, row i, section 8. This section 

 is 45 IX caudal to the lingual crossing, X 115. reduced i. 



Figs. 6, 7, 8. Three successive coronal sections through the anlages of the sub- 

 maxillary and sublingualis major of the left side of a pig embrj'O of 

 19 millimeters. Princeton Collection, No. 168. Slide 13, row 2, 

 sections 5, 4, 3. The section of Fig. 6 is 30 /i caudal to the lingual 

 crossing, X 115, reduced \. 



1. Alveolingual region. 



2. Circumlingual space. 

 J. Marginal ca\'ity. 



4. Lingual sulcus. 



5. .\lveolar sulcus. 



7. Submaxillary proliferation, keel or duct. 



S. Postglandular flange. 



p. Flange common to submaxillarj' and sublingualis major. 



70. Intermediate element. 



11. Sublingualis major. 



12. Supralingual sulcus. 



13. Juxta-alveolar sulcus. A furrow present in embp,-os of 17-IQ millimeters, 



parallel and lateral to the alveolar sulcus and situated caudal to the 

 lingual ner\'e. 



14. Lingual nerve. 



15. Submaxillani' ganghon. 



16. Hypoglossal ner\-e. 

 77. Meckel's cartilage. 

 7^. Palate process. 



iQ. Tongue. 



