. The structure and classification of birds . eM^-gharacteristicSjwhich have been emphasised byParker, and perhaps rather toolightly toup^ed upon by their desmognathJ^ (which isa complejie-^ftlsion) they are, ofcourser^nserine, the form of themaxillo-palatines most recallingthose of Mergus. The form of thepalatines is duck-like or gallina-ceous in the rudimentary characterof the internal lamina, which is amere ridge. The pterygoids arearticulated to the large oval duck-Hke basipterygoid processes, nearerto their middle than is the casewith the Anseres. The lacrymalsare small, quite c
. The structure and classification of birds . eM^-gharacteristicSjwhich have been emphasised byParker, and perhaps rather toolightly toup^ed upon by their desmognathJ^ (which isa complejie-^ftlsion) they are, ofcourser^nserine, the form of themaxillo-palatines most recallingthose of Mergus. The form of thepalatines is duck-like or gallina-ceous in the rudimentary characterof the internal lamina, which is amere ridge. The pterygoids arearticulated to the large oval duck-Hke basipterygoid processes, nearerto their middle than is the casewith the Anseres. The lacrymalsare small, quite contrary to whatis found among the Anseres,though the ectethmoids are not unlike those of thelatter group. The anterior part of the face, with the clear-cut holorhinal nostrils and the hooked bill, is suggestive of-Gariama or a gallinaceous bird ; it does not at least recall theduck or goose. The interorbital septum is deficient in front, Not even a rudiment of these characteristically avian structures has, so faras I am aware, been Fig. 215.—Skull of Chaunaderbiana. Ventbal Aspect.(Aftee Gakkod.) 456 STEUCTUEE AND CLASSIFICATION OF BIEDS but not fenestrate posteriorly. Occipital fontanelles areabsent. Though perhaps rightly placed in the neighbourhood ofthe geese, it is obvious, from what has been said, that thePalamedeidse are distinguished from them by many differ-ences, of which the most important are perhaps— (1) Continuous feathering. (2) Absence of biceps slip to patagium. (3) Peculiar form of intestinal caeca. (4) Normal character of biceps cruris. (5) Emphysematous character of skin and breaking up ofcervical air sacs. On the other hand there is nothing in the skull whichforbids an association with the Anseres, and the windpipe,,with its two pairs of extrinsic muscles, is decidedly it must be remembered that this feature is also foundamong Galli, and in a few other forms. ANSERES Definition.—Oil gland tufted. Aftersliaft small or absent.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898
