Avium oculi.
Falconis Chrysaeti oculus.
J^Lquila, volucrium nobilissima, ob visum inter aves, imo inter cuncta forsan animalia, facile acutissimum certe non immerito celebrata quare oculum ejus summa cura dissecui et accuratissime delineavi.
Oculorum bulbi parum mobiles in orbitis haud profundis firmiter se* dent, superne osse superciliari proprio tecti, pariete intergeri.no osseo, tenui, ab invicem tantum separati, magnitudine cerebrum aequantes. Diameter transversa axi paulo major, hemisphaerium posterius globosum, anterius conicum, quasi protuberans.
Sci erotica in fundo oculi convexa, ubique tenuis, parum flexilis, e duabus laminis constans, externa nempe cum nervi optici vagina connata, fibrosa, alba, scleroticae mammalium similior 2 ): interna cartilaginea, elastica, subpellucida, prope nervi insertionem rotundata, distincta margine terminata. Duabus his laminis ad anteriora reflexis intercedit annulus osseus 3 ) j versus rostrum latior ac versus aurem, infundibiliformis, externe incurvatus, in medio validissimus, versus marginem anteriorem et magis adhuc versus posteriorem extenuatus. Componitur quatuordecim
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Aristotelis de animalibus historiae lib. IX. c. <23. 6. ex edit. Schneider T, I. p. 445,
2) Arbers’s Beyträge zur Anatomie und Physiologie der Thiere. Heft 3. 1802. p. 42. in oculis avium omnium scleroticam tribus laminis construi, interiores ambo in margine inferiori annuli ossei terminari, mediam vero cum sclerotica mammalium esse comparandam. Ex industria de annulis osseis in avium oculis repe- riundis egit.
3) Optime jam describitur a Malpighio opera posthuma. Londini 1697 p. 82.