90 
ILLINOIS BIOLOGICAL MONOGRAPHS (90 
EXPLANATION OF PLATE 
Fig. 77.—Transverse section posterior to the external naris of the adult Hyla pickeringii. 
Fig. 78.—Transverse section through the lamina externa of the same animal. 
Fig. 79.—Transverse section through the choana of a 9 mm. Bufo americana. 
Fig. 80.—Transverse section through the fenestra naso-basalis of Bufo. 
Fig. 81.—Transverse section slightly anterior to the preceding section. 
Fig. 82.—Transverse section through the external naris of the same animal. 
Fig. 83.—Transverse section through the muscularis process of the quadrate of Rana viridescens 
28 mm. long. 
Fig. 84.—Transverse section through the pons ethmoidalis of the same animal. 
Fig. 85.—Dorsal view of model of the nasal capsule of a young adult of Rana viridescens. 
Fig. 86.—Side view of model of the nasal capsule of the same animal. 
amp 
anc 
cc 
ce 
ch 
crs 
ort 
fen nb 
fon 
fs 
ag 
ipe 
jo 
Id 
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 
lamina externa 
muscularis process of quadrate 
nasal organ 
oblique cartilage 
olfactory nerve 
planum basale 
pons ethmoidalis 
pterygoid process 
platum tectale 
planum verticale 
quadrato-ethmoidalis 
solum anterius 
superior prenasal cartilage 
trabecula 
