Freiburger historische Bestände - digital

EXPLANATION

OF

PLATE 36.

V

Fig. 1—3 are schematical representations of median sections of various Mammalian skulls to illustrate the
various development of the anterior face (marked by a red line) of the intermaxillary bone from the starting
point, as represented by the fig. 1, to the reduction, as in fig. 2, and, on the other side, to an excessive development
, as in fig. 3. Further the figures illustrate the development of the cartilaginous (blue) and ossified
(orange) parts of the nasal septum. The vomer has been painted yellow.

Fig. 1. Macropus.

— 2. Phoccena.

— 3. Old Elephant.

Fig. 4—7 are schematical representations of the right half of the nasal cavity of the skull to illustrate the
presumably phylogenetic development of some remarkable characters of the skull of the Elephant. The sectioned
bones have been painted yellow, the maxilloturbinal (mi) red, the organon Jacobsoni blue, z intermaxillary
bone, n nasal bone, o opening of maxillary sinus.

Fig. 4. Dog. The turbinate parts of the maxilloturbinal have been cut off.

Fig. 5—6. Presumably intermediate stages between the starting point, as exemplified by the Dog, and
the Elephant.

Fig. 7. Elephant.

Fig. 8. Median section of the head of a Lamb, the septum having been removed and most of the ethmo-
turbinals cut off, the nasoturbinal having been left undamaged; of the maxilloturbinal the turbinate part has
been cut off, only the anterior and the posterior end of it have been left. The mucous membrane is present.
A little schematised, nl nasoturbinal; a prolongation from it extends into the opening of the maxillary sinus.

Fig. 9. Part of the same specimen after the mucous membrane having been taken away. The nasoturbinal
(nl) is cartilaginous in front and this cartilaginous part is continuous with the cartilaginous nose. Below the
margin of the cartilaginous nasoturbinal are seen four small detached cartilaginous nodules.