By A. J. , Ed. Marshall
Quantity I. within binding torn yet all pages intact, and canopy edges a bit scuffed..Hardback,Ex-Library,with ordinary stamps markings, ,in reasonable to reliable all-round condition,no airborne dirt and dust jacket,518pages.
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Extra resources for Biology and Comparative Physiology of Birds. Volume II
But, though the eyes of owls are incapable of any movement at all in their sockets, most birds are capable of forward convergence toward the tip of the beak: as is well known, the bittern can direct its eyes almost vertically downward (in the morphological sense) so that an intruder may be scrutinized with both eyes when the bird is in its characteristic cryptic posture with the beak pointing toward the zenith. II. The Retina Apart from the presence of specialized regions (areae and foveae) the retina of diurnal birds is characterized by the very high densities of cones.
In such birds the choana establishes the only communication with the exterior. The two primary choanas open in an unpaired space which communicates with the buccal cavity by a single secondary choana. B. NASAL GLANDS One or two pairs of tubular nasal glands are variously situated. They may occur in front of the orbita, in the sinus orbitalis or in the sinus maxillaris, in the orbita itself or in special supraorbital grooves of the frontal bone (Technau, 1936; Marples, 1932). The openings of the ducts of these glands are relatively uniform in their situation in the hind part of the vestibule.
Versuch einer systematischen Morphologie des Gehirns der Vögel. Rev. suisse zool. 26: 17-112. Lapicque, L. (1909). Le poids de l'encéphale dans les différents groupes d'oiseaux. Bull. Muséum hist. nat. (Paris) 15: 408-412. , and Girard, P. (1905). Poids de l'encéphale en fonction du poids du corps chez les oiseaux. Compt. rend. soc. biol. 57: 665-668. Larsell, O. (1948). The development and subdivisions of the cerebellum of birds. J. Comp. Neurol. 89: 123-190. , and Wiener, H. (1898). Beiträge zur Anatomie und Physiologie des Centralnervensystems der Taube.
Biology and Comparative Physiology of Birds. Volume II by A. J. , Ed. Marshall