J PLATE III. 
Megaptera nodosa, Bonn. 
Fic. 1.—Exterior face of left periotic bone, with tympanic bulla attached. From a foetus, 13} feet 
long. a, tympanic membrane. Bay of Islands, N.Z. 
Fie. 2.—Interior face of the above. 
Fie. 3.—Anterior view of the above. a, tympanic membrane. 
Fic. 4.—Exterior face of right tympanic bulla of adult specimen. Bay of Islands, N.Z, 
Fic. 5.—Interior face of the same. a, the attached malleus. 
