s 



T 



c^;3:v;: 









Figure log. Diagrammatic cross-section through the base of the skull and the ear of a 

 Mysticete. E = epidermis ; Bl = blubber ; C = connective tissue a?id muscles; X = external 

 auditory meatus {closed part) ; W = wax plug; F ^ finger-shaped projection of eardrum; 

 L = band-shaped ligament of eardrum which receives the sound vibrations and conducts them 

 to the auditory ossicles; T = tympanic cavity; F = foam-filled cavities surrounding the 

 ear-bone; P = petrosal; B = bulla; S = bones of skull. {Reysenbach de Haan, 1956.) 



Figure no. Bottom view of the skull of a 

 False Killer showing position of earbone. 

 (Van Beneden and Gervais, 1880.) 



