NECTURUS MACULATtrS. 



429 



Table C. 

 Comparison of nomenclature of important parts of the skull. 



1 The form given here is taken direct from the text of the author cited, and may be in one case the plural and in another 

 the singular fonn, or may be used as an adjective. These differences are of course without significance. 



'Gaupp, in suggesting the term "paraciuadratuin " leaves open a possible, or even probable, homology with the tympani- 

 cum of mammals, and in the frog has so named the corresponding bone. 



