Freiburger historische Bestände - digital

EXPLANATIONS

OF

PLATE 30.

Fig. 1. Skull of a young Bear (Ursus sp.) from the underside. Besides the three milk-molars (and in the
left maxillary anteriorly the tip of the pt), the first permanent molar, m1, is present. Caudad to this is seen an
outgrowth of the maxillary, posteriorly through a cleft separated from the palatine bone; in this protuberance
the germ of the second molar, m2, is contained. {.

Fig. 2. Skull of a Jersey-Cow seen from the underside. All permanent teeth present. The horns have
been omitted. The two posterior molars, m2 and m 3, have their place in the here permanent posterior outgrowth
of the maxillary, which outgrowth is separated from the palatine bone through a deep and broad cleft.

pneumatic sinus

closed suture between ethmoid and presphenoid

II

presphenoid
orbital fissure (III, IV, V,, VI)
Va (foramen rotundum)

alisphenoid

basisphenoid

hind end of basisphenoid, where it has joined the basioccipital

orbitosphenoid

margin of frontale, where it has joined the parietale

frontale

lamina ciibrosa

foramen ethmoidem
ethmoid

margin of frontale, where it has joined the squamosum

p- V3 (foramen ovale)

posterior end of alisphenoid canal

Fig. 3. Part of the broken-up skull of the Elephantine skull b, consisting of the frontals, the ethmoid, the
presphenoid and the basisphenoid, seen from behind. The upper part of the ethmoid has not yet been wholly
ossified and therefore a large irregular opening is seen in it. //—VI openings for cranial nerves.

nasoturbinal

ethmoturbinals

ossilied nasal septum

remnant of closed suture between ethmoid
and presphenoid

suture between frontale and ethmoid

margin where the frontal has joined the intermaxillary

frontale

margin where Ihe frontal has joined the maxillary

orbitosphenoid
presphenoid

thin bony lamella round the maxillary, formed by
the alisphenoid

pterygoid coalesced with the alisphenoid

basisphenoid

orifice, which has been closed by a membrane, opening into the excavated basisphenoid

Fig. 4. The same piece seen from below.