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 
ce 
a 
alinasal cartilage 
columna ethmoidalis 
cavum inferius 
cavum medium 
cavum superius 
cornu trabeculae 
external naris 
fenestra naso-basalis 
foramen nasalis internus 
foramen olfactorius 
foramen orbito-nasalis 
internasal space 
inferior prenasal cartilage 
la 
le . 
mpq 
oc 
pe 
pb 
bp 
pt 
pu 
ge 
sa 
labial cartilage 
lamina externa 
muscularis process of quadrate 
oblique cartilage 
pons ethmoidalis 
planum basale 
pterygoid process 
planum tectale 
planum verticale 
quadrato-ethmoidalis process 
solum anterius 
superior prenasal cartilage 
trabecula 
