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 allegkaniensis two weeks old. 

 Fig. 23. Dorsal view of model of nasal capsule of Cryptobranchus atteghaniensis 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. 

 c cupola mni median nasal incisure 



ce columna ethmoidalis pa processus antorbitalis 



cr t crista trabeculae pb plamim basale 



ci cornu trabeculae pnp prenasal process 



en external naris pp pterygoid process 



fne foramen nasalis exteraus pi planum tectale 



ins internasal space pv planum verticale 



le lamina externa q quadrate 



Im lamina medialis / trabecula 



