. The structure and classification of birds . racheal Pouch of the Emu, P. 7. S. , p. 40o. - For the lungs and air sacs of Struthiones see ante, p. 495. Those ofRhea have been described by W. N. PARKER, Note on the Respiratory Organsof Rhea, P. 7. S. 1883, p. 141 ; of Dromceus by MALM, Om Luftrur-s-ickrn,&c., Off. K. TV/. Ak. Forh. 1880, p. 33. 3 PANDER and DALTON, Die Skclcte rfcr Ktraussartic;cn VUgcL Bonn, 1827. 512 STRUCTURE AND CLASSIFICATION OF BIRDS bone to the outer part of a nasal and to the naso-maxillaryof the Dinornithidse (see below). There is a well-developed, though thin an
. The structure and classification of birds . racheal Pouch of the Emu, P. 7. S. , p. 40o. - For the lungs and air sacs of Struthiones see ante, p. 495. Those ofRhea have been described by W. N. PARKER, Note on the Respiratory Organsof Rhea, P. 7. S. 1883, p. 141 ; of Dromceus by MALM, Om Luftrur-s-ickrn,&c., Off. K. TV/. Ak. Forh. 1880, p. 33. 3 PANDER and DALTON, Die Skclcte rfcr Ktraussartic;cn VUgcL Bonn, 1827. 512 STRUCTURE AND CLASSIFICATION OF BIRDS bone to the outer part of a nasal and to the naso-maxillaryof the Dinornithidse (see below). There is a well-developed, though thin and curved,ectethmoid lamina, which joins the maxillo-palatine belowand the descending process of the lacrymal above. This hasbeen also stated to be absent. Rhea has seventeen cervical vertebra. The atlas isnotched, as in Struthio, but not so widely. In the shouldergirdle the procoracoid is short, but is continued down to thearticulations of the coracoid by the menibrana coracoidea,of which, in a specimen of Rhea macrorhynclia before me, a. FIG. 242.—STERNUM OF Rhea (AFTER MIVART).cc, coracoid grooves ; ca, anterior lateral process ; /, keel i ?) : It; posterior lateral process. portion is ossified as a thin spicule of bone shutting in theforamen coracoideum. The sternum (see fig. 242) has amedian ventral prominence and two lateral thin rings of thebone, which may be indications of foramina. Three (some-times four) pairs of ribs reach the sternum. The pelvis(fig. 243) has a small pectineal process. The pubes jointhe ischia posteriorly, and anteriorly an interobturator pro-cess, of which there are faint indications in Struthio, unitethe two bones. Posteriorly the ilia are attached to theischia. STRUTHIONES 513 The structure of the skull of the emu : is not widelydifferent from that of the skull of Ehea, The vomer iswidely bifurcate behind, where it articulates both withpterygoids and palatines. The basipterygoids articulatewith the pterygoids at the extreme posterior end of the
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898
