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Length of skull ... ... 
Width of ditto . . ... 
“ between orbits 
Length of nasal bones . 
Width of ditto behind. 
From front of foremost incisor to back 
of last molar tooth ... 
Length of four upper true molar teeth 
taken together ... . 
u of palate . 
1 * of lower jaw, to back of condyle 
“ of four true molar teeth of 
ditto taken together . 
* The only skull of P. Swainsonii I have seen has the hinder part imperfect; hence I cannot give its exact length : but, taking the proportions 
of the other parts as my guide, it must be very nearly 1 inch 4 lines; from the tip of the interm axillaries to the back of the frontal bones, it 
measures 114 lines : the width of the palate between the last molars is 2 J : the width of the skull must be about 7 lines. 
