The Labyrinth of Animals (Volume 2); Including Mammals, Birds, Reptiles and Amphibians - Softcover

Inhaltsangabe

This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1908. Not illustrated. Excerpt: ... GRUIFORMES THE MEMBRANOUS LABYRINTH OF THE CROWNED CRANE Balcarica. pavonina The labyrinth of the crane is comparatively large, measuring 15.0 mm. from the vertex of the superior canal to the tip of the cochlea. The cochlea has a length of 4.5 mm. from the tip to the anterior margin of the oval window. The diameter of the tube of the cochlea opposite the oval window is 2.0 mm. The vestibule measures 3.5 mm. in its longest diameter, and the major axis of the oval window has a length of 1.5 mm. A small otolith is present in the utricle in the usual place immediately internal to and behind the openings of the ampullae of the superior and horizontal canals. The superior canal measures 6.0 mm. in internal, and 8.0 mm. in external diameter. The height of the vertex of the canal above the vestibule is 6.5 mm., and the diameter of the canal itself at the vertex is 1.25 mm. The posterior canal has internal and external diameters of 4.75 mm. and 6.5 mm. respectively. The height of the vertex of the canal above the vestibule is 3.25 mm., and the diameter of the canal itself at the vertex is rather more than 1.o mm. The horizontal canal measures 4.5 mm. in internal, and 6.5 mm. in external diameter. The height of the vertex of the canal above the vestibule is 3.o mm., and the diameter of the canal itself at the vertex is 1.o mm. The points of chief interest in the labyrinth of the crane are as follows. The superior canal is distinctly of the upright type, and the perilymph space is well marked in all the canals. Although this canal is of the erect type, the posterior limb does not descend very far, so that there is no communication between it and the same limb of the horizontal canal, as in the pigeon and the buzzard. The usual communication between the posterior and horizo...

Die Inhaltsangabe kann sich auf eine andere Ausgabe dieses Titels beziehen.