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Show 1897.] MR. P. E. BEDDARD ON INTERCENTRA IN BIRDS. 467 somewhat conical intercentrum. The five following intercentra are "hypocentra"-that is to say, they are completely ankylosed Fig. 1. Caudal vertebrae c&Biziura lobata. 1, lateral view; 2, from below. Bel., pelvis; a, hypocentra; b, free intercentra. with the centra; a lateral notch only remains to prove their distinctness from the centra. In Tachyeres cinerea there is a granule of bone only to represent the first intercentrum of Blzlura; the two next vertebras have short hypocentra, these increase in the three next; between the 6th and the 7th is a free conical intercentrum mainly attached to but not ankylosed with the last free caudal. Sarcldlornis carunculata, which has five free vertebrae behind the last, which has acquired an attachment to the pelvis, has two free conical intercentra lying between nos. 3/4 and 4/5. In Fuligula rufina there is an ankylosed hypocentrum on the fourth free caudal. In the two remaining free vertebras in front of the pygostyle the intercentra are not ankylosed. Plectropterus gambensls has a minute nodule between the^ first and second free caudals, and four hypocentra upon the remaining vertebras, ankylosed. In Bernlcla brenta there are minute nodules between C. 1 and C. 2 and between C. 2 and C. 3, but no hypocentra beyond. PALAMEDEcE. In Chauna derblana there are four free caudals. There are four intercentra which increase in size. |