. The structure and classification of birds . times called parapteron)are long feathers suggestive of remiges, while the row im-mediately above bears the same relation to the pseudo-remiges as the tectrices majores do to the true remiges. Onthe ventral surface of the wing are similar tectrices minoreswith a similar specialisation of an hypopteron (representingthe parapteron above, and sometimes called axillaries), withits row of special coverts. The patagium is mainly filledup with several rows of feathers, which are collectivelytermed the marginals; anteriorly,* upon the pollex, theyform toge
. The structure and classification of birds . times called parapteron)are long feathers suggestive of remiges, while the row im-mediately above bears the same relation to the pseudo-remiges as the tectrices majores do to the true remiges. Onthe ventral surface of the wing are similar tectrices minoreswith a similar specialisation of an hypopteron (representingthe parapteron above, and sometimes called axillaries), withits row of special coverts. The patagium is mainly filledup with several rows of feathers, which are collectivelytermed the marginals; anteriorly,* upon the pollex, theyform together with the anterior feathers of the minores theso-called ala spuria. The ala spuria is specialised into foursmall quills with coverts, the specialisation being quite likethat of the humerals at the other extremity of the yving. 10 STBUCTURE AND CLASSIFICATION OF BIRDS So much then for the arrangement of the feathers in thetypical bird selected; we must now consider the divergenciesfrom this constituted normal. The fifth cubital, absent in. Fig. 1.—Wisa of Golden Plovek (afteb Goodohild), 1-1, posterior border; 2-3, ; A, remigas ; S, greater wing ooverts ; C, D,median coverts; fi, Fy remaining coverts. the wild duck, is often present in birds. The terms quin-cubital and aquincubital have been devised to expressthese facts. The following groups are quincubital: Crypturi, Gralli, Ehinochetidse, Cuculi, many the other hand aquincubital birds are— ColymbidEe, Tubinares, Steganopodes, Herodiones, Acoi-pitres, Auseres, &c. The majority of birds, in fact, have not the fifth cubitalremex. The most remarkable fact about this missingremex is that it is either absent or present ; in no case arethere any intermediate conditions, such as a small remex, See SoLATEE, Eemarks on the Fifth Cubital Eemex, &o., Ibis (6), ii. 1890,p. 77. PEATHEES 11 The only explanation, so far as I am aware, of thisremarkable state of affairs is contained in a suggestive paperby
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898
