PLATE 1 
EXPLANATION OF FIGURES 
1 Ventral view of the head of Acanthias blainvillii, showing the labial folds 
and furrows. X 2/5. 
2 The same, dissected on one side to show the labial cartilages. X 2/5. 
3 Lateral view of the head of a small adult Polypterus, the mouth slightly 
open, ~X<.-2. 
4 The same, the mouth forced widely open. X 2. 
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