82 



ILLINOIS BIOLOGICAL MONOGRAPHS 



(82 



EXPLANATION OF PLATE 



Fig. 34. — Dorsal view of model of nasal capsule of a young larva of Pipa americana. 



Fig. 35. — Ventral view of the same model of Pipa americana. 



Fig. 36. — Dorsal view of model of nasal capsule of Bufo americana 9 mm. body length. 



Fig. 37. — Posterior view of anterior half of model of nasal capsule of Bufo americana 9 mm. 



body length. 

 Fig. 38. — Dorsal view of model of nasal capsule of the adult Hyla pickeringii. 

 Fig. 39. — Side view of model of nasal capsule of the adult Hyla pickeringii. 

 Fig. 40. — ^Dorsal view of model of nasal capsule of Rana viridescens 28 mm. total length. 



anc alinasal cartilage 



ce columna ethmoidalis 



ci cavum inferius 



cm cavum medium 



cs cavum superius 



ct comu trabeculae 



en external nans 



fen nb fenestra naso-basalis 



fni foramen nasalis intemus 



fo foramen olfactorius 



fon foramen orbito-nasalis 



ins intemasal space 



ipc inferior prenasal cartilage 



la labial cartilage 



le lamina externa 



mpq muscularis process of quadrate 



oc oblique cartilage 



pe pons ethmoidalis 



pb planum basale 



pp pterygoid process 



pt planum tectale 



pv planum verticale 



qe quadrato-ethmoidalis process 



sa solum anterius 



spc superior prenasal cartUage 



/ trabecula 



