Coracoid 67-75 mm. Humerus 132-147 " Radius 126-134 " Ulna 129-142 " Metacarpus 76-85 " The smaller bones, undoubtedly, belonged to female, and the larger to male individuals. {95} CENTRORNIS ANDREWS. Allied to _Chenalopex_ and _Chenopis_, but differs from _Chenalopex_ in the form and proportion of its metatarsus, and from all other Anserine forms by the extreme length and slenderness of the shaft of the tibio-tarsus and the relative shortness of the fibular crest. From _Chenopis_ it differs in several respects, and the very long fibular crest of the latter at once separates them. CENTRORNIS MAJORI ANDREWS. _Centrornis majori_ Andrews, Ibis 1897, p. 344, pl. VIII. This species was discovered by Dr. Forsyth Major and Monsieur Robert in the bed of an old lake at Sirabé, Central Madagascar, in 1896-1897. It was similar in many respects to _Sarcidiornis_ and _Chenalopex_ but differed in its large size and the great length of its legs. Indeed, judging from the slenderness of the metatarsus and femur and the slight degree of inflection of the lower end of the long tibia, it seems probable that this bird was ill adapted for swimming, though a good runner. The wings were long and powerful and armed with a long spur. I must refer my readers for a fuller description to Mr. Andrews, as quoted above. The measurements are:-- _Tibia._ Length (exclusive of cnemial crest) 213-215 mm. Width of upper articular surface 20-21 " Width of middle of shaft 11-11.5 " Thickness of shaft 8.5-9 " Width of distal extremity 20-21 " _Femur._ Length 103-107 mm. Width of proximal extremity 25-26 " Width of distal extremity 26 " Width of shaft 11 " {96} _Metatarsus._ Length 130 mm. approx. Width of shaft 8.5 " Width of middle trochlea 10 " _Coracoid._ Length 31 mm. Width of glenoidal surface 13 " _Scapula._ Width at proximal extremity 23 mm. _Radius._ Length 24 mm. _Ulna._ Width at middle of shaft 10 mm. _Metacarpus._ Greatest width at proximal extremity 31 mm. Length of spur 26 " Width of second metacarpal 9 " Habitat: Madagascar. {97} CNEMIORNIS OWEN.