. A dictionary of birds . hvvo-carotidinx (Garrod) are very frequent, Rhea and Apteryx among CARO TIDS— CARP US 77 the Ratitae, Podicipes, several Steganopodes, A lea, Otis, Turnix,Megapodiidse, some Old-World Psittaci, Merops, Buceros, Upupa,Trogonid?e, Cypselidte, Colius, all the Pici and Passeres. •4. One carotis conjuncta, but the right root alone is present,the left being obliterated. This carotis primaria dextra is likewisedeeply lodged, as in the 2nd and 3rd cases, and has hitherto beenobserved only in Eupodotis. In the following three cases, one or two collateral and super-ficiall
. A dictionary of birds . hvvo-carotidinx (Garrod) are very frequent, Rhea and Apteryx among CARO TIDS— CARP US 77 the Ratitae, Podicipes, several Steganopodes, A lea, Otis, Turnix,Megapodiidse, some Old-World Psittaci, Merops, Buceros, Upupa,Trogonid?e, Cypselidte, Colius, all the Pici and Passeres. •4. One carotis conjuncta, but the right root alone is present,the left being obliterated. This carotis primaria dextra is likewisedeeply lodged, as in the 2nd and 3rd cases, and has hitherto beenobserved only in Eupodotis. In the following three cases, one or two collateral and super-ficially-placed arteries take the place of one or both deep carotids. 5. A carotis primaria s. profunda dextra coexists with a carotissuperficialis s. collateralis sinistra. All the American and a fewOld-World Parrots are such Aves hicarotidinse abnormales (Garrod). 6. Two supex^ficial carotids, a right and left, are present, thedeep or primary vessels being entirely obliterated. Hitherto only ^ c. A. B. C. D. DlAGRAMJIATIC REPRESENTATION OF SOME OF THE VARIATIONS OF THE CAROTID ARTERIES. Ao. Aorta ; suA. A. subclavia dextra ; A. subclavia sinistra ; A. carotis profundadextra; A. carotis profunda sinistra; A. carotis profunda conjuncta; superficialis sinistra. A. normal condition, two separate deep carotids ; B. the two deep carotids fused into one, Ardea ; C. the same as B, but the root of the left carotid is reduced, Phoenicopterus ;B. the left deep carotid is lost, but supplanted by a superficial vessel, certain Psittaci. observed by Ottley { 1879, p. 461), as an individual varia-tion of Bucorvus abyssinicus. 7. The only carotis is a c. superficialis sinistra, all the othervessels being lost, observed by Forbes in Orthonyx spinicauda (notin 0. ochrocephala), this being the only exceptional case of all thePasseres hitherto examined. It is clear that the 2nd case is directly referable to
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Keywords: ., bookauthorlyde, bookcentury1800, bookdecade1890, booksubjectbirds
