. A monograph on the anatidae, or duck tribe. GENUS VT. CYGNUS. Ext. Char. Pedes magni, digitis posterioribus parvis, gibbosis. mediis longissimis. Ros-trum magnum, lateribus parallelibus. Nares subovales, in medio rostri posits. Cervia longa. Anat. Char. Trachea tubula equali, aliquando in sterno penetrante. Larynx inferutt{ ossea. Sternum carina antice incurvata. Ext. Char. Feet large, Avitb tbe posterior toes small, gibbous, the middle ones large, tbe sides parallel. Nostrils suboval, placed in tbe middle of* tbe bill. Neck long. ANAT. Char. Trachea with the tube of equal size,
. A monograph on the anatidae, or duck tribe. GENUS VT. CYGNUS. Ext. Char. Pedes magni, digitis posterioribus parvis, gibbosis. mediis longissimis. Ros-trum magnum, lateribus parallelibus. Nares subovales, in medio rostri posits. Cervia longa. Anat. Char. Trachea tubula equali, aliquando in sterno penetrante. Larynx inferutt{ ossea. Sternum carina antice incurvata. Ext. Char. Feet large, Avitb tbe posterior toes small, gibbous, the middle ones large, tbe sides parallel. Nostrils suboval, placed in tbe middle of* tbe bill. Neck long. ANAT. Char. Trachea with the tube of equal size, sometimes penetrating the Larynx osseous. Sternum with the keel anteriorly curved. Cygnus. Ray. Briss. Anas. Linn. Lath. Type. Cygnus ? ? 1 J 19 [ \ The proportions of the skeleton are as follow :—Depth of the keel to the length of thesternum, as 1 to 4. Breadth of pelvis to its length, as 1 to 2j. Length of sternum to that of tibia,as 1 to 2. Depth of cranium to its length, as 1 to 3. Affinities. Although we have placed the swans with the geese, we are not by any meanscertain that it is their proper place.
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Keywords: ., bookauthorlearedwa, bookcentury1800, bookdecade1830, bookyear1838
