. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. 74 THE BONES. pletely closes the excavation which concurs to form the maxillary siuus. In the skeleton there is also found behind, and at the base of this turbinated boue, a vast opening which is totally closed in the fresh condition by the pituitary membrane. Tlie maxillary siuus is not prolonged in its interior. In the smaller Ruminants, the cavity of the sinus is closed by the maxillary turbinated bone in a more complete manner than in the Ox. B. Camel.—The ethmoidal turbinated bone is very .small. Otherwise
. The comparative anatomy of the domesticated animals. Horses; Veterinary anatomy. 74 THE BONES. pletely closes the excavation which concurs to form the maxillary siuus. In the skeleton there is also found behind, and at the base of this turbinated boue, a vast opening which is totally closed in the fresh condition by the pituitary membrane. Tlie maxillary siuus is not prolonged in its interior. In the smaller Ruminants, the cavity of the sinus is closed by the maxillary turbinated bone in a more complete manner than in the Ox. B. Camel.—The ethmoidal turbinated bone is very .small. Otherwise it is as in the other Ruminants. C Pig.—The same arrangement as in the Sheep and Goat, except that the bones are much longer and less fmgile. D. Carnivora.—These bones in the Dog and Cat are particularly distinguished for their numerous con- volutions. Neither participate in the formation of the frontal or niaxillary sinuses; the latter is not in any way closed by the maxillary turbinated bone, but opens into the nasal cavity by a large gaping aperture. E. Rabbit.—The bones are arranged as in the Dog, but the folds are less numerous. 9. Vomer (Figs. 34, 38). This, a single bone, elongated from above to below, flattened on both sides, and extending on the median line from the body of the sphenoid to the premaxillary bone, offers for study two lateral faces, two borders, and tivo extremities. The fares are smooth, plane, and covered by the nasal membrane. The anterior border is channeled for the whole of its length by a deep groove, which receives the posterior border of the cartilaginous septum of the nose. The posterior border is sharp and smooth in its upper half, which separates the two guttural openings of the nasal cavities : it is thick and slightly denticulated for the remainder of its extent, and rests on the median suture resulting from the union of the two supermaxillary bones. The superior extremity is provided, in its middle, with a notch which divides it int
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