PLATE IV. 



FIG. SIZE. 



1. Proteus anguin-us 1 (adult). Left Shoulder-plate ; inner view . . 4 diam. 



2. Menobranchus laterdis a (adult male). Right Shoulder-plate; upper view . 2 do. 



3. Do. do. inner view . . . do. 



4. Amphiuma didactylum? Right Shoulder-plate ; inner view. From Hyrtl's dis- 



section and figure . . 4 do. 



5. Salamandra maculosa* (\ inch 6 lines long). Shoulder-girdle, outside ; side view 12 do. 



6. Do. (do.) do. and Sternum ; lower 



view .... do. 



7. Do. (nearly adult). Shoulder-plate, outside ; side view . 5 do. 



8. Do. (old) do. do. . . . 4 do. 



9. Do. (do.) do. and Sternum ; lower view do. 



10. Do. (do.) do. ; end view . . do. 



11. Do. (do.) Section of Sternum . . 10 do. 



12. Triton cristafus* (old male). Shoulder-girdle and Sternum; lower view . do. 



13. Do. (do.) Shoulder-plate, outside ; side view . . do. 



14. Do. (do.) Sternum ; lower view . . 9 do. 



15. Do. (do.) do. upper view . . .do. 



1 See pp. 58, 59. 2 See pp. 59, 60. 3 See p. 62. 



4 See pp. 65, 66. 5 See pp. 64, 65. 



