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Show 1892.] CLASSIFICATION OF BIRDS. 255 Rhamphotheca: whether simple or compound, i. e. consisting of more than two pieces on the upper bill. C. Skeleton. Palate: Schizo-desinognathous. Nares, whether pervious or impervious, i. e. with or without a complete solid naso-ethmoidal septum. Basipterygoid processes: whether present, rudimentary, or absent; and their position. Temporal fossa, whether deep or shallow. Mandible : os angulare, whether truncated or produced ; long and straight or recurved. Number of cervical vertebrae. Haemapophyses of cervical and of thoracic vertebrae : occurrence and shape. Spina externa and spina interna sterni: occurrence, size, and shape. Posterior margin of the sternum, shape of. Position of the basal ends of the coracoids: whether separate, touching, or overlapping. Procoracoid process : its size and the mode of its combination with acrocoracold. Furcula : shape; presence or absence of hypocleidium and of interclavicular process. Groove on the humerus for the humero-coracoidal ligament: its occurrence and depth. Humerus, with or without ectepicondylar process. Tibia: with bony or only with ligamentous bridge, near its distal tibio-tarsal end, for the long extensor tendons of the toes : occurrence and position of an intercondylar tubercle, in vicinity of the bridge. Hypotarsus : formation with reference to the tendons of the long toe-muscles:-(1) simple, if having only one broad groove; (2) complex, if grooved and perforated ; (3) deeply grooved and to what extent, although not perforated. Toes : number and position, and connexions. D. Muscles. Garrod's symbols of thigh-muscles A B X Y,-used, however, in the negative sense. Formation of the tendons of the m. flexor perforans digitorum : the number of modifications of which is 8 (I.-VIII.) according to the numbering in Bronn's Vogel, p. 195, and Fuerbringer, p. 1587. E. Syrinx. Tracheal, broncho-tracheal, or bronchial. Number and mode of insertion of syringeal muscles. F. Carotids. If both right and left present, typical : or whether only left present, and the range of the modifications. G. Digestive Organs. Convolutions of the intestinal canal. Eight types, numbered I.-VIII., according to Bronn's Vogel, p. 708, and P. Z.S. 1889, pp. 303-316. r 18* |