29ti 



H. H. WILDER, 



There is a possible objection to the second set of terms, on the 

 ground that in accordance with the more usual action of these muscles, 

 the origin and insertion should be reversed, but as these terms are 

 more or less relative and as in the majority of cases the physiological 

 meaning of these terms may be reversed, it is felt that anatomically 



md 



Fig. A. 



Hy 



Br. I 



Br. II 



Br in 



Br. IV 



Br. V 



Trigeminus 



Facialis 



Glosso-pha- 

 ryngeus 



Vagus J 



Vagus , 



Vagus 3 



Vagus ^ = R 

 recurrens. 



V^ fail. 



Diagram of the brauchial musculature based upou tlie condition in Necturus. V^ and 

 i>3 is not represented in Necturus, but is usually present in Urodeles. Md 

 mandible ; Hy Hyoid arch. Br. I — IV branchial arches ; Br. V Cartilago lateralis (the 

 respiratory cartilages). V^__„ the ventral muscular segments of the visceral arches (see 

 text) ; -Dj_j the dorsal segments of the same. The words in the column on the right 

 refer to the nerves supplying the segments. 



the median raphes are better interpreted as the origins, and that the 

 arches, which are readily movable and generally free, may serve well 

 as insertions. 



A comparison of this diagram with the condition in Necturus 

 and the other Urodeles, and the correspondence between the above 

 terminology and the terms in common use, may be shown by the 

 following table : 



