. The structure and classification of birds . a. FIG. 154.—HORIZONTAL SECTIONS OF FIG. 155.—o, GIZZARD OF CarpoplnnjnGIZZARDS OF, «, Ptilopus jcu/ibu, latraiifi. l>, ONE OF HORNY TUBER-b, Trcron calva (AFTER GARROD). CLES IN SECTION. (AFTER GARROD.) differs, and is typical of the pigeons in general; there is nodown. All pigeons have a well-developed crop, the presence ofwhich organ is presumably related to their fruit- and grain-eating mode of life. In Carpopliaga, a fruit-eating pigeon, the gizzard is veryweak ; but in other pigeons this organ is very strong, itswalls being even ossified i

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. The structure and classification of birds . a. FIG. 154.—HORIZONTAL SECTIONS OF FIG. 155.—o, GIZZARD OF CarpoplnnjnGIZZARDS OF, «, Ptilopus jcu/ibu, latraiifi. l>, ONE OF HORNY TUBER-b, Trcron calva (AFTER GARROD). CLES IN SECTION. (AFTER GARROD.) differs, and is typical of the pigeons in general; there is nodown. All pigeons have a well-developed crop, the presence ofwhich organ is presumably related to their fruit- and grain-eating mode of life. In Carpopliaga, a fruit-eating pigeon, the gizzard is veryweak ; but in other pigeons this organ is very strong, itswalls being even ossified in Caloenas In Ptilop//,*a cross section of the gizzard has the peculiar form shownin the accompanying drawing, where it is compared with a 1 YERREAUX and DBS Mrns describe an exaggeration like this in Plimnorhinagoliatli, where also the tubercles are ossified (Rev. Mag. Zool. 1&G2, p. 138).See also FLOWEK, On the Structure of the Gizzard of the Nicobar Pigeon,P. Z. S. 1860, p. 330. COLUMB/E 307 pigeon showing a more norma

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898