90 



ILLINOIS BIOLOGICAL MONOGRAPHS 



[90 



Fig. 77. 

 Fig. 78 

 Fig. 79. 

 Fig. 80 

 Fig. 81. 

 Fig. 82 

 Fig. 83. 

 28 

 Fig. 84 

 Fig. 85. 

 Fig. 86 



amp 



anc 



cc 



ce 



ch 



cr s 



crt 



fen nb 



fon 



fs 



ig 



ipc 



jo 



Id 



EXPLANATION OF PLATE 



— Transverse section posterior to the external naris of the adult Hyla pickeringii. 

 — Transverse section through the lamina externa of the same animal. 

 — Transverse section through the choana of a 9 mm. Bufo americana. 



Transverse section through the fenestra naso-basalis of Bufo. 

 — Transverse section slightly anterior to the preceding section. 

 — Transverse section through the external naris of the same animal. 

 — Transverse section through the muscularis process of the quadrate of Rana viridescens 

 mm. long. 



. — Transverse section through the pons ethmoidalis of the same animal. 

 — Dorsal view of model of the nasal capsule of a young adult of Rana viridescens. 

 — Side view of model of the nasal capsule of the same animal. 



anterior maxillary process 



alinasal cartilage 



cavum cranii 



columna ethmoidalis 



choana 



crista subnasalis 



crista trabeculae 



fenestra naso-basalis 



foramen orbito-nasalis 



frontal branch of superficialis 



intermaxillary gland 



inferior prenasal cartilage 



organ of Jacobson 



lacrimal duct 



le lamina externa 



mpq muscularis process of quadrate 



no nasal organ 



oc oblique cartilage 



on olfactory nerve 



pb planum basale 



pe pons ethmoidalis 



pp pterygoid process 



pi platum tectale 



pv planum verticale 



qe quadrato-ethmoidalis 



sa solum anterius 



spc superior prenasal cartilage 



/ trabecula 



