. Handbook of field and general ornithology; a manual of the structure and classification of birds . , parietal;so, superoccipital; asc, an-terior semicircular canal;sc, a sinus (venous canal);ep, epiotic; eo, exoccipital; op, opisthotic ; po, prootic, with 7, meatus auditorius intemus,for entrance of 7th nerve ; 8, foramen for vagus nerve ; ho, basioccipital; ht, basitemporal; ic,canal (in original pituitary space, Fig. (36, ic) by which carotid artery enters brain cavity; ap,basipterygoid process ; ap to rbs, rostrum of the skull, being the parasphenoid bone under-flooring the basisphenoid a
. Handbook of field and general ornithology; a manual of the structure and classification of birds . , parietal;so, superoccipital; asc, an-terior semicircular canal;sc, a sinus (venous canal);ep, epiotic; eo, exoccipital; op, opisthotic ; po, prootic, with 7, meatus auditorius intemus,for entrance of 7th nerve ; 8, foramen for vagus nerve ; ho, basioccipital; ht, basitemporal; ic,canal (in original pituitary space, Fig. (36, ic) by which carotid artery enters brain cavity; ap,basipterygoid process ; ap to rbs, rostrum of the skull, being the parasphenoid bone under-flooring the basisphenoid and future perpendicular plate of ethmoid. (The scaffolding of theupper jaw not shown, excepting px, etc.) circular canal; the prootic with the anterior vertical canal, betweenwhich and the foramen ovale (5) for the lower divisions of thetrifacial nerve it lies. That part on which the inner foot of thequadrate is implanted is i)ro6tic. Below the drooping eaves of thesquamosal, before the flaring wing of the exoccipital, and behindthe quadrate bone, is the always decided and considerable cavity of. 234 GENERAL ORNITHOLOGY the ear, bounded pretty sharply by the squamosal and exoccipitalrmi, sloping with less distinction in front toward the orbital this auditory hollow ma}^ be seen several openings : the meatus or proper ear-passage, throughwhich, in one direc-tion, a bristle maybe passed to emergeat or near themiddle line of thebase of the skull,about the root ofthe basisphenoidalrostrum. Such apassage is throughthe first visceralcleft of the earlyembryo, modifiedinto meatus audi-torius and Eusta-chian tube, whichlatter communicateswith the back partof the mouth. Be-sides the other ear-passages proper,may be found otheropenings of air-passages leadinginto the interiordiploic tissue of*^* bones of the skull, Fig. 71.—Ripe chicks skull, in profile, x 3 diameters; after and especially into Parker, px, premaxillary; aln, alinasal cartilage; en, septo- ,„ Ip^^p,. iri-^
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Keywords: ., bookauthorcouesell, bookcentury1800, bookdecade1890, bookyear1890
