BAL^NOPTERA. 



61 



4. Skull of a young male 18 feet long, with left half of 



mandi])le. Length of skull 3 feet 6i inches; length 

 of maxilla from notch 2 feet 2 inches, breadth at base 

 of beak 1 foot 3 ins. Elie, Firth of Forth, July 1879. 



5. Skull of an adult about 30 feet long, with mandible. 



Length of skull in straight line 5 feet 9i inches ; 

 length of maxilla from notch 3 feet 8 ins., breadth at 

 base 2 feet. Nasals 6| inches long, greatest breadth of 

 each 2 ins. Figure below. Dunbar, September 1871. 



<3. Skull, young, 3 feet 4 inches long, with mandible and baleen 

 wreaths in situ ; length of maxilla from notch 2 feet 

 1 inch, breadth 1 foot 1 inch. Alloa, October 1888. 



7. Tympanic bones, pair of, from skull No. 4. Length of 

 ])one 3i inches, breadth 1"8 inch, vertical depth 2^ 

 inches ; outer surface convex, short and shallow, 

 groove separating it into two divisions, anterior 

 division If inch long from groove, posterior division 

 1| inch, anterior border ridged and defined by a 

 shallow depression. Keel-like inferior ridge strong ; 



