6 
7 
PLATE 2 
EXPLANATION OF FIGURES 
Ventral view of head of Pristis antoquorim. Copied from Miller and 
Henle. 
Ventral view of head of Scyllium ecanicula. X 2. 
Ventral view of head of Chiloseyllium punctatum. Copied from Miiller 
and Henle. 
Ventral view of head of Heterodontus francisci. X 2. 
The same, the lower jaw removed and the nasal frill pulled back on left 
hand side of figure. X 2. 
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