Freiburger historische Bestände - digital

EXPLANATION (2)

OF

PLATE 30.

squamosum

aquseductus vestibuli
tympanicum

jugale

Fig. 6.

aquaed.vestibuli

carotid canal
tympanicum

border of tympanicum and petrosum

VIII VII

Fig. 5. Left jugale, squamosum, petrosum and tympanicum of the Elephantine skull /? seen from the medial side.
Fig. 6. Left petrosum of the fetal Elephantine skull a seen as fig. 5.

opening of the bony meatus auditorius
squamosum
VII

articular surface of squamosum

cartilage between the tympanohyale and the stylohyale

tympanohyale
tuba Eustachii -~

squamosum which has joined the exoccipital

margin of petrosum which has joined the exoccipital

margin of the tympanicum which has joined the exoccipital

carotid canal

Fig. 7. The same piece as that figured in fig. 5 (only the jugal has been omitted) seen from the under side.

Fig. 8. Transverse section of the anterior part of the skull of a Dog. In the middle is seen the cartilaginous
septum nasi, whose inferior thickened margin is imbedded in the vomer. The wall is composed of: the nasal
bone with the nasoturbinal projecting into the nasal cavity, the intermaxillary, and the maxillary, to which
is attached the maxilloturbinal. For comparison with the following figures.

Fig. 9—14. Series of transverse sections through the rostrum of Phoccena communis. In all of them, with
the sole exception of fig. 9, is seen in the middle line below the (white) median nasal cartilage (= cartilaginous
septum of other Mammals) the vomer. On both sides of the cartilage (and the vomer) are situated the inter-
maxillaries; and again on the side of the intermaxillary and the vomer the maxillary. In fig. 14 on the right
side of the figure the section has also hit the anterior end of the jugal.

cartilago paraseptalis intermaxillary

cartilaginous septum nasi

Fig. 15. A following section of the same series, through the anterior part of the orbit.