336 



B. F. KINGSBURY 



*Three embryos that had been loaned to Prof. S. H. Gage by Prof. F. P. Mall 

 were kindly placed at my disposal as well. They were examined for the stage 

 of development of the thyreoid and number and position of the parathyreoids, 

 and are therefore included in the above list. 



a clear conception of the fundamental morphology of the region; 

 the primitive and typical plan which is more or less modified 

 and departed from in the particular form considered. In the 

 case of the human pharynx the attempt at once carries the in- 

 vestigator into controverted ground and brings him face to face 

 with the problem of primitive chordate types and the 'Ancestry 



