The appendicular muscles of Necturus maculosus. 423 



Explanatiou of the flgures. 



Plate 23—27. 



Fig. 1. Lateral view of Shoulder region ; superficial. 



Fig. 2. Similar to Fig. 1, but turned slightly towards the ventral 

 side, and with the gills drawn away from the trunk muscles. 



Fig. 3. Lateral view of the shoulder-girdle, with the deeper muscles. 



Fig. 4. Iriner (medial) surface of scapula, with muscle attachments. 



Fig. 5. Ventral view of the Shoulder region ; superficial. 



Fig. 6. ßight shoulder-girdle and anterior appendage, with their 

 muscles ; detached from the body. Lateral view. 



Fig. 7. Right anterior appendage with a portion of the girdle, 

 showing the muscles of the upper arm. 



Fig. 8. Same view as the preceding, with the muscles drawn apart. 



Fig. 9. Same view as the preceding, after removal of the super- 

 ficial muscles. 



Fig. 10. Same view as the preceding. The deepest muscles. 



Fig. 11. Ventral view of hip girdle ; superficial. 



Fig. 12. Same view as the preceding; a more advanced dissection. 

 The left side is dissected farther than the right. 



Fig. 13. Ventral view of the hip girdle, with the deepest muscles; 

 designed especially to show the puboischiofemoralis internus. 



Fig. 14. Inner (dorsal) aspect of the hip girdle, with limb. 



Fig. 15. Same view as the preceding; deeper muscles. 



Fig. 16. Lateral view of the hip girdle; skeleton. 



Fig. 17. Lateral view of the hip girdle, showing M. puboischio- 

 femoralis internus. 



Fig. 18. Lateral view of the hip girdle ; superficial. 



Fig. 19. Same view as the preceding; deeper muscles. 



