PLATE 3 
EXPLANATION OF FIGURES 
7 Transverse section through the hind-gut of an 8.6 mm. larva of Lepidos- 
teus osseus. X 300. 
8 Transverse section through the hind-gut of a 9.3 mm. larva of Lepidos- 
feus osseus. XX 300. 
9 Transverse section through the hind-gut of a 10.7 mm. larva of Lepidosteus 
osseus. X 300. 
10 Transverse section through the hind-gut of a 14.1 mm. larva of Lepidosteus 
osseus. > 300. 
11 Transverse section through the hind-gut of a 17 mm. larva of Lepidosteus 
osseus. X 300. 
