. The structure and classification of birds . g in Speotyto cunicu-laria, in which the proportionsare nearly equal, viz. 38 : skull of Strix furtherdiffers from that of other owlsin the swollen character ofthe prefrontal processes,which are thin, almost paper-like sheets of bone in otherowls. The interorbital septumof Strix is thick, while in theremaining genera it is reducedto a thin dividing lamina, as isthe case with most birds. The sknll characters of the o-pmis FlG 125~CoLIC CECA OF Plt°todiltl* (AFTER BEDDABD). Photodilus are to some extent intermediate between Strix and the remai
. The structure and classification of birds . g in Speotyto cunicu-laria, in which the proportionsare nearly equal, viz. 38 : skull of Strix furtherdiffers from that of other owlsin the swollen character ofthe prefrontal processes,which are thin, almost paper-like sheets of bone in otherowls. The interorbital septumof Strix is thick, while in theremaining genera it is reducedto a thin dividing lamina, as isthe case with most birds. The sknll characters of the o-pmis FlG 125~CoLIC CECA OF Plt°todiltl* (AFTER BEDDABD). Photodilus are to some extent intermediate between Strix and the remaining genera of theStriges. The interorbital septum of Photodilus is notso thick as in Strix, but, 011 the other hand, not so thin as inother owls, as, for example, Bubo. The prefrontals, althoughnot so swollen as in Strix, are not nearly so flattened as they 1 Absent in Spcotyto; cf. SHUFELDT, Notes on the Anatomy of SweatytoCJonrn. Morpli. iii. 18S.), p. 122. - See for certain details of skull structure PARKER, Linn. Trans. (2), i. p. 248 STRUCTURE AND CLASSIFICATION OF BIRDS are in Bubo, where, as already explained, they are thinplates, hardly thicker than a piece of paper. So far Photo-dilus agrees with Strix ; but there are points in which theskull of this aberrant owl is nearer to the bubonine sectionof the order. It has not the occipital convexities which areso striking a feature of the skull of Strix. Finally Pliotodiliisis strigine in the non-extension over the occcipital region ofthe temporal fossse, which do so extend in many of theBubonidae. In Strix there is but one notch on either side
Size: 1160px × 2154px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898
