76 ILLINOIS BIOLOGICAL MONOGRAPHS [76 



EXPLANATION OF PLATE 



Fig. IS. — Dorsal view of model of nasal capsule of an adult Diemictylus viridescens. 

 Fig. 16. — Dorsal view of model of nasal capsule of Triton crislatus 28 mm. long. 

 Fig. 17. — Dorsal view of model of nasal capsule of Triton crislatus 35 mm. long. 

 Fig. 18. — Dorsal view of model of nasal capsule of Spderpes bilineatus 15 mm. long. 

 Fig. 19. — Dorsal view of model of nasal capsule of Spderpes bilineatus 37 mm. long. 

 Fig. 20. — Dorsal view of model of nasal capsule of Spelerpes biiineatus 46 mm. long. 



ins intemasal space 



Im lamina medialis 



pa processus antorbitalis 



pb planum basale 



^pe pons ethmoidalis 



pnp prenasal process 



pt planum tectale 



t trabecula 



