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| Purves, P.E.; Utrecht, W.L. van. |
| 3. An account is given of sound conductivity experiments which were carried out on the auditory structures in a very fresh, dead specimen of Tursiops. 4. The probable function of the external auditory meatus is discussed in relationship to the arrangement of the accessory air sinuses of the middle ear. 5. The so-called ”auditory scanning” behaviour in odontocete cetaceans is commented upon in the light of preliminary experimental evidence of a vocal sound diffraction pattern. |
| Tipo: Article / Letter to the editor |
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| Ano: 1963 |
URL: http://www.repository.naturalis.nl/record/504731 |
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| Bree, P.J.H. van; Purves, P.E.. |
| The dimensions are given of three skulls of Lipotes vexillifer, the only specimens preserved in collections outside of China. At the same time drawings of the Lipotes vexillifer skull in the British Museum (Natural History) have been made and published with a photograph of the London specimen before it was dissected. Reasons are stated for refuting the affinity of Lipotes with Platanista, as postulated by Hinton & Pycraft (1922). |
| Tipo: Article / Letter to the editor |
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| Ano: 1975 |
URL: http://www.repository.naturalis.nl/record/504787 |
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| Schenkkan, E.J.; Purves, P.E.. |
| The nasal complex of Kogia has been compared with that of Physeter and shown to be homologous with that of less specialized ondotocetes. The nasal complex of the Physeterids is structurally related to that of the Platanistids and Ziphioids. The spermaceti organ unique to the Physeteridae forms a part of the functional morphology of the right naris and is not a bilaterally symmetrical structure like the melon of other odontocetes. Separation of the two nares in the Physeteridae is caused by the asymmetrical development of the spermaceti organ. In Kogia part of the musculature of the left naris actuates the opening of the right naris, a feature unique amongst the Mammalia. The right naris is not used in external respiration but forms an air reservoir... |
| Tipo: Article / Letter to the editor |
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| Ano: 1973 |
URL: http://www.repository.naturalis.nl/record/504039 |
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| Purves, P.E.; Bree, P.J.H. van. |
| Cadenat (1959) and Rancurel (1964) produced strong indirect evidence that off the west coast of Africa, the Bottle-nosed Dolphin, Tursiops truncatus, is in the habit of diving very deeply, possibly down to 600 m. Examination of the skulls of fully adult specimens of Tursiops taken off Dakar and St. Helena revealed marked distension and fenestration of bones associated with the accessory air sinuses of the middle ear. The condition suggests a pathological enhancement of the normal processes of evolution of these bones in order to adjust to excessive middle ear pressure sustained intermittently over a long period. |
| Tipo: Article / Letter to the editor |
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| Ano: 1972 |
URL: http://www.repository.naturalis.nl/record/504799 |
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