. A dictionary of birds . lateraland supra-occipitalsand parietals. ThePeriotics consist ofthree distinct ele-ments, which in size,relatiA^e position andin regard to the sur-rounding bones ex-hibit many modifi-cations, forming avery difficult chapterof ornithic anatomywhich as yet has been touched by few,^ though an exhaustive studyof them promises results of prime taxonomic importance. TheProotic (Petrosal of some writers) abuts upon the Alisphenoid, andwith the latter encloses the foramen ovule, through which passes the3rd branch of the nervus trigemmHS,whi\e between the posterior marginof t
. A dictionary of birds . lateraland supra-occipitalsand parietals. ThePeriotics consist ofthree distinct ele-ments, which in size,relatiA^e position andin regard to the sur-rounding bones ex-hibit many modifi-cations, forming avery difficult chapterof ornithic anatomywhich as yet has been touched by few,^ though an exhaustive studyof them promises results of prime taxonomic importance. TheProotic (Petrosal of some writers) abuts upon the Alisphenoid, andwith the latter encloses the foramen ovule, through which passes the3rd branch of the nervus trigemmHS,whi\e between the posterior marginof the Prootic and the anterior border of the Lateral Occipitals liesthe fe7iestra oralis,^ into which fits the base of the Cohimdla of the ear,and the fenestra rotunda. Dorsally the Prootic adjoins the Epiotic ^ Among them are the late Prof. \V. K. Parker in several of his numerouspapers, Prof. Huxley in his Elements of Comparative Anatomy and Prof. Selenka(Bronns) Thier-Eeich. ^ Inadvertently called foramen ovale on p. SJo,Skull of Common Fowl from beneath. (After Parker.) SKULL 875 (sometimes the Mastoid of Parker), which is often very small andonly develops several irregular ossifications that soon fuse with thesupra-occipital. The Opisthotic {Mastoid of Selenka) lies betweenthe Epiotic and the Lateral Occipitals, with which last it ultimatelyfuses, and in some birds—Larus (Gull) for example—it actuallyhelps to bound the foramen magmim. The Basisphenoids are ventrally overlaid by a pair of membrane-bones, the Basitemporals of some authors, and laterally they helpto form the lower and anterior border of the auditory meatus(Ear, p. 176), while each Eustachian tube (/. c.) is, roughly speaking,accompanied and partly covered by a canal for the passage of theCarotids (p. 76) and some of their branches. The Basisphenoidsfrequently articulate with the Pterygoids by the basipterygoidPROCESSES (p. 28), and their dorsal surface supports the greaterportion of the base of the Bra
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Keywords: ., bookauthorlyde, bookcentury1800, bookdecade1890, booksubjectbirds
