. The structure and classification of birds . thous. In classificatory importance perhaps next comes thecondition of the nasal bone. Garrod distinguished birdsinto those with holorhinal and those with schizorhinalnostrils. These terms refer to the posterior edge of the bonynostril, which in one set of birds, the holorhinal, ends behindwith a clear oval outline (fig. 81), or in the schizorhinalbirds runs back as a gradually narrowing chink ; this latterarrangement is shown in fig. 82. In the holorhinal bird astraight line, drawn across the face from the posteriorboundary of one nostril to that
. The structure and classification of birds . thous. In classificatory importance perhaps next comes thecondition of the nasal bone. Garrod distinguished birdsinto those with holorhinal and those with schizorhinalnostrils. These terms refer to the posterior edge of the bonynostril, which in one set of birds, the holorhinal, ends behindwith a clear oval outline (fig. 81), or in the schizorhinalbirds runs back as a gradually narrowing chink ; this latterarrangement is shown in fig. 82. In the holorhinal bird astraight line, drawn across the face from the posteriorboundary of one nostril to that of the other, p^-sses infront of the termination of the nasal processes of thepremaxilla. It is not always the case that a line drawnsimilarly to that of the holorhinal birds passes behind the OSTEOLOGY 143 end of the premaxillary process, but it is generally so. Inthe schizorhinal skull it often appears, as in the typicalschizorhinal cranes and charadriiform birds, as if the outerpart oi the nasal bone were a distinct bone; for it joins the. Pig. 81 Skull op Lateral View. (After Beddard.) inner lamina at an angle. In the typical holorhinal skull,,on the other hand, as, for example, in the Rallidse, the twoparts of the nasal come smoothly together, leaving the clear-
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898
