78 ILLINOIS BIOLOGICAL MONOGRAPHS [78 



EXPLANATION OF PLATE 



Fig. 21. — Side view of model of nasal capsule of Spelerpes bilineatus 46 mm. long. 

 Fig. 22. — Side view of model of nasal capsule of Cryptobranchus alleghaniensis two weeks old. 

 Fig. 23. — Dorsal view of model of nasal capsule of Cryptobranchus alleghaniensis five weeks old. 

 Fig. 24. — Ventral view of model of nasal capsule of Cryptobranchus alleghaniensis three months 



old. 

 Fig. 25. — Dorsal view of model of nasal capsule of Necturus maculatus 25 mm. long. 

 Fig. 26. — Dorsal view of model of nasal capsule of Necturus maculatus 30 mm. long. 

 Fig. 27. — Dorsal view of model of nasal capsule of a young adult of Plethodon erythronotus. 



