. Bulletin of the British Museum (Natural History). i6 HEARING IN CETACEANS fying through the pecuHar fatty tissue that occurs in odontocetes within the angle of the lower ; Anthony & Coupin (1930) appear to be the first to have described the air sacs of a ziphioid, Mesoplodon bidens. The extent of their observations is limited by lack of material. Comparison is made between the guttural pouch of various Peris- sodactyls and the Beaked Whales ' air sacs. "In Mesoplodon the gutteral pouch consists of a large bag of which the two expansions, one superior and posterior (the smal
. Bulletin of the British Museum (Natural History). i6 HEARING IN CETACEANS fying through the pecuHar fatty tissue that occurs in odontocetes within the angle of the lower ; Anthony & Coupin (1930) appear to be the first to have described the air sacs of a ziphioid, Mesoplodon bidens. The extent of their observations is limited by lack of material. Comparison is made between the guttural pouch of various Peris- sodactyls and the Beaked Whales ' air sacs. "In Mesoplodon the gutteral pouch consists of a large bag of which the two expansions, one superior and posterior (the smaller), and the other inferior and anterior, are lodged on the external face of the pterygoid ;. Fig. 2. Boenninghaus' (1903) figure of the venous drainage of the base of the cranium in Phocaena. I. Cavernous sinus. 2. Superior petrosal sinus. 3. Inferior petrosal sinus. 4. Transverse sinus. 5. Longitudinal sinus. 6. Internal jugular vein. 7. Common jugular vein. 8. Emissary vein from the foramen lacerum medium. 9. Bulbous venosus epibularis of Boenninghaus, 10. Fibro-venous of the pterygoid. II. Pterygoid vein. 12. Corpus cavemosum. 13. Ramus bulbi venosi ad jugularem internam of Boenninghaus. 14. Ramus bulbi venosi ad jugularem externam of Boenninghaus. 15. External jugular vein of Boenninghaus. 16. Spinal venous plexus, a. Periotic, b. tympanic bulla. Scholander (1940) in his classic paper on the respiratory function in diving animals and birds states " On the inner rear side of the lower jaw of the Bottlenose on each side, is an air recess, each with a maximal capacity of about I 1. The recesses are in open connection with the nasal cavity and can be completely ; Finally Yamada (1953) figures, but does not describe in detail, the arrangement of air sacs in Berardiiis bairdi and Kogia breviceps. The foregoing historical account of the structure of the accessory air sinuses in cetaceans is in general agreement with the writers' own finding,
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