. The structure and classification of birds . angles withthat which follows; there is thus formed a conspicuous kink inthe neck, which is never unbent. hoc. cit. (on p. 409.) Osteologia Avium, p. 218. Ueber die Halswirbelsaiale der Vogel, &c., Arch. f. Anat. u. Phys. 1873,p. 357. * Notes on the Anatomy of Plotus cmMmga, P. Z. S. 1876, p. 335, and Note on Points in the Anatomy of Levaillants Darter (Plotus Levaillanti), , p. 679. * On some Points in the Anatomy of the Indian Darter, &c., ibid. 1882,p. 208. Notes on the Anatomy and Osteology of the Indian Darter (Plotusmelanogaster), ib
. The structure and classification of birds . angles withthat which follows; there is thus formed a conspicuous kink inthe neck, which is never unbent. hoc. cit. (on p. 409.) Osteologia Avium, p. 218. Ueber die Halswirbelsaiale der Vogel, &c., Arch. f. Anat. u. Phys. 1873,p. 357. * Notes on the Anatomy of Plotus cmMmga, P. Z. S. 1876, p. 335, and Note on Points in the Anatomy of Levaillants Darter (Plotus Levaillanti), , p. 679. * On some Points in the Anatomy of the Indian Darter, &c., ibid. 1882,p. 208. Notes on the Anatomy and Osteology of the Indian Darter (Plotusmelanogaster), ibid. 1892, p. 291. 414 STRUCTURE AND CLASSIFICATION OF BIRDS On the ninth vertebra there is on the dorsal surface a fibrousloop ( Donitzs bridge), which is fibrous only in P. anhinga,ossified in the three other species. Through this loop passes thetendon of the longus colli posterior muscle to be inserted on tovertebrsB 2, 3, 4. The longus colli anterior is a very powerfulmuscle, which ends in a long tendon attached anteriorly to the. Fig. 193.—Stomach of Levaillants Darter (after Garrod). haemapophysis of cervical vertebrae 8-10. A separate portion ofthe muscle is similarly attached to the eleventh. The pulling back of the head preparatory to striking is effectedby the longus colli posterior, while the bayonetting movementis produced by the longus colli anterior. The second characteristic feature in the organisation of Plotusconcerns the stomach. Though originally described by Maogilli- STEGANOPODES 416 VEAY in Audubons ornithological miscellany, it has been more fullydescribed and illustrated by Gabeod and Poebes. One greatpeculiarity is that in P. anhinga the proventricular glands, insteadof forming a patch, or patches, upon the inner surface of theproventriculus, constitute a special csecal diverticulum of thestomach, which is completely lined by the glands in pyloric portion of the stomach forms a well-marked compart-ment, quite distinct from the gizzard regi
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