. The structure and classification of birds . eus. Its ends receive behind thepterygoid and palatines, which are thusprevented from articulation with thebasisphenoidal rostrum. There are largebasipterygoid processes and the head ofthe quadrate is single, as in struthiousbirds. The supraorbital chain of bonesfigured by Parker in Tinamus robustusis another archaic skull character of thesebirds.^ The nasals, lacrymals, andadjoining bones are very much like those of Bhea and not atall like those of gallinaceous birds. Between the nasalsposteriorly is a considerable tract of ethmoid,^ appearing • O
. The structure and classification of birds . eus. Its ends receive behind thepterygoid and palatines, which are thusprevented from articulation with thebasisphenoidal rostrum. There are largebasipterygoid processes and the head ofthe quadrate is single, as in struthiousbirds. The supraorbital chain of bonesfigured by Parker in Tinamus robustusis another archaic skull character of thesebirds.^ The nasals, lacrymals, andadjoining bones are very much like those of Bhea and not atall like those of gallinaceous birds. Between the nasalsposteriorly is a considerable tract of ethmoid,^ appearing • On certain Muscles of the Thigh of Birds, &c., P. Z. S. 1873, p. 642. On the Osteology of Gallinaceous Birds and Tinamous, Zool. Trans, v. ■■ Absent, according to Lucas ( Notes on the Osteology of the SpottedTinamou, Froc. TJ. S. 1887, p. 157), in Nbthzira maculosa. Erof. Pabkee wrote, in 1862 (loc. cit. p. 213); I suppose that in the tina-mou, as in. other ostriches, the broad top of the ethmoid is separately developed. Fig. 233.—Skuli. ofTinamus robustus(AriER Huxley). Pmx, premaxillse; Mxp,maxillo-palatines; yo,vomer ; H, palatines ;Ptt pterygoids. TINAMI 491 upon the surface of the skull. The outer descending part ofthe nasal reaches the maxilla, and with the upper part of thebone encircles the holorhinal nasal foramen; it is notankylosed with the lacrymal. The latter descends andarticulates with the jugal by a very distinct facet, especiallydistinct in Bhynchotus rufescens. The bone also becomesfused with the lateral wing-like process of the ethmoid,forming a complete ring of bone round a relatively verywide foramen. A special point of resemblance to Bhea andDrommus is the perforation of the descending process of thelacrymal itself. This is best seen in Bhynchotus rufescens ;in Galodromas elegans, Nothura maculosa, and Grypturustataupa, there is merely a notch which in the fresh skull maypossibly be converted into a foramen by a ligament. FuEBEiNGBE giv
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898
