. Contributions to the anatomy of birds . outwardsso as to almost toucli the infraorbital bar, as a club-like process in Sarcor-hamphus gryphas and P. caiifornianus. Its outer side shows the groovefor the lacrymal duct. By the assistance of the lateral extensions ofthe ethmoid, these bones make a very substantial partition between theorbital cavities and the rhinal chamber; above and between the twothere is an opening for the passage of the nasal nerve and vessels. It is difficult to say, from an examination of the skulls of the adultbirds, whether the vomer exists in them as a separate ossifi
. Contributions to the anatomy of birds . outwardsso as to almost toucli the infraorbital bar, as a club-like process in Sarcor-hamphus gryphas and P. caiifornianus. Its outer side shows the groovefor the lacrymal duct. By the assistance of the lateral extensions ofthe ethmoid, these bones make a very substantial partition between theorbital cavities and the rhinal chamber; above and between the twothere is an opening for the passage of the nasal nerve and vessels. It is difficult to say, from an examination of the skulls of the adultbirds, whether the vomer exists in them as a separate ossification or not;we are of the opinion, however, that it does not; at any rate, there isno such bone present as we find among many of the Ducks and Geese(it must be remembered, however, in this connection that this delicatelittle oone is often lost in the maceration and preparation of aviancrania). » The ethmoid (the mesethmoid of Parker) meets the vault of the rhinalspace above in a spreading abutment; from this point it takes a direction. Catharista atrata. downwards and backwards in the mesial plane, to become consolidatedwith the extremity of the basi-presphenoid, below. Behind, by extensionof its median osseous plate, it assists to complete the orbital septum,w-hile laterally it develops on either side alar productions that amalga-mate with the lacrymals, as pointed out above. On its anterior face wehave presented us a sharpened edge, extending up and down the bonein the mesial plane. The lateral wings in G. aura are removed far to theback, and they have from their lower boundaries horizontal plates de-veloped that reach forward beyond the basi-presphenoidal tip, to the 746 GEOLOGICAL SURVEY OF THE TERRITORIES. anterior base of the bone. This is a constant character and is only to beobserved in Gatkartes a u ra. The palatines are broad plates of bone, with,a wide fissure separating them^ anteriorly their extremities are wedgedinto the anchylosed articulation in common with t
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbirds, bookyear1882
