. The structure and classification of birds . cribesa special slip of rhomboideus profundus, arising separatelyfrom ilium. The anconaus has a tendinous humeral the thigh the muscle formula is either AXY— (niost Capri-mulgi) or XY— {Steatornis). The tibialis anticus tendon ofPodargus is double. Theglutaeus I. extends over biceps inNyctidromus, &c., not in .Mgotheles. No glutaeus V. Thereare sometimes both and sometimes only one of the twoperoneals present. In Steatornis and jEgotheles only thebrevis is to be found, in Nyctidromus only the longus ; inPg^argush&th, 238 STRUCTURE AND CLASS
. The structure and classification of birds . cribesa special slip of rhomboideus profundus, arising separatelyfrom ilium. The anconaus has a tendinous humeral the thigh the muscle formula is either AXY— (niost Capri-mulgi) or XY— {Steatornis). The tibialis anticus tendon ofPodargus is double. Theglutaeus I. extends over biceps inNyctidromus, &c., not in .Mgotheles. No glutaeus V. Thereare sometimes both and sometimes only one of the twoperoneals present. In Steatornis and jEgotheles only thebrevis is to be found, in Nyctidromus only the longus ; inPg^argush&th, 238 STRUCTURE AND CLASSIFICATION OF BIRDS The goatsuckers have by no means a uniform skullstructure. In Caprimulgus the skull may be termed palatines are enormously expanded, and between theirposterior extremities (not indicated in the figure) are a smallanterior and posterior medio-palatine, a state of affairs recall-ing the Picidee () The vomer is a long bone, distinctlypaired in the young bird, rounded in front. It articulates. Fig. 118.—Skull ob Caprimulgtis (afibb Huxley).Pmx^ premaxilla; Mxp, maxillo-palatine ; Vo, vomer; PI, palatine; Pt, pterygoid. v?ith the hook-like maxillo-palatines. Bach of the latter isconnected by a ligament with the internal forward process ofthe palatine of its own side, the hinder part of which islargely ossified. The basipterygoid processes are well de-veloped. The lacrymal is large and binds upon the ectethmoids are attached to the broad outer flange ofthe palatines by a cartilaginous prolongation. Pakkek, On the Structure and Development of the Birds Skull, (2), i. OAPRIMULGl 289 In Chordeiles the skull is nmch upon the same plan,but the maxillo-palatines meet in the middle line, and mayeven become ankylosed. The skull is thus desmognathous, in fact. In C, virgi-nianus, however, the bones do not meet. The skull of Nyctibius jamaicensis (see fig. 119), de-scribed by HuxiiBY, is not widely different from that of Capri-
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1898
