. The Encyclopaedia Britannica; ... A dictionary of arts, sciences and general literature. rbito-nasal nerve () grooves theseptum, gets bridged over by it, and creeps down to its ownproper facial bar—the trabeculae. And the result of themetamorphosis in this Carinate bird is the formation of apear-shaped fenestra () between the eyeballs. Thiswindow was not cut out by Nature it- a fit of economy (asthe mere teleologists vainly speak), but is a fairly com-menced separation of the common crest of the coalescedtrabeculae from the ethmoid forwards and the presphenoidbehind {, ) T
. The Encyclopaedia Britannica; ... A dictionary of arts, sciences and general literature. rbito-nasal nerve () grooves theseptum, gets bridged over by it, and creeps down to its ownproper facial bar—the trabeculae. And the result of themetamorphosis in this Carinate bird is the formation of apear-shaped fenestra () between the eyeballs. Thiswindow was not cut out by Nature it- a fit of economy (asthe mere teleologists vainly speak), but is a fairly com-menced separation of the common crest of the coalescedtrabeculae from the ethmoid forwards and the presphenoidbehind {, ) The notch behind the cartilaginous frame of this windowis formed b|^ membrane into the optic foramen. Aline drawn horizontally along the base of the fenestra, andanother vertically to the upper margin of its narrow end,would mark out the starved presphenoid, without aloe, ofthis bird ; for the mesethmoid aud the basi-sphonoid (, Sea Parker On Ostrich Skull, PAii. Trans., 18G0, plnt« 7,6g. 2, , and plate 8, fiR. 10, Oa Ostticb SkulU plate 15, fig. 8, ,p,e., 3-25. Flo. 12—Axial pai-t of the same skull, x 4dlumeteis. The new lettera aie „ jfroorefor nasal neive; , cianlo-facial cleft;, Bupe -vomeiiue lamina; 7).^,. perpen-dicular ethmoid: Inter-orbital fea-eatra; , orbito-sphenoid. ) meet below the fenestra. Underneath the inter-orl>itaIplate the parasphenoid balk (quite distinct) is seen, andunderneath the basal bones the basi-temporal slab ()Turning again to the birds-eye view (fig. 9.), we see thatthe notochord is now enclosed in a spearhead-shaped bone,the basi-occipital () It is ridged above by the enclosednotochord, and, behind, the swelling halves of the condyle() are seen. This basal bone is truncated in front,and forms the hinder margin of the wide rounded pos-terior basi-cranial fontanelle () On each side arethe exoccipitals (), and, above, the perfected occipitalarch has a pair of su
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