. Catalogue of the fossil birds in the British Museum (Natural History). 316 Genus PACHYORNIS, Lydekker (gen. nov.). Syn. Palnpteryx, Haast' (non Owen, typically). The skull is either vaulted or flattened, with a sharp and narrow beak^, and shorter and more rounded paroccipital processes, and more prominent basioccipital tubercles than in Anomalopterya-, the quadrate and mandible closely resembling those of that genus. Fig. Pachyornis clcphantopus.—Sternum. \. a, costal process ; b, lateral process. The sternum (fig. 64) is flat, and very broad and short, with no coracoidal facets, a very
. Catalogue of the fossil birds in the British Museum (Natural History). 316 Genus PACHYORNIS, Lydekker (gen. nov.). Syn. Palnpteryx, Haast' (non Owen, typically). The skull is either vaulted or flattened, with a sharp and narrow beak^, and shorter and more rounded paroccipital processes, and more prominent basioccipital tubercles than in Anomalopterya-, the quadrate and mandible closely resembling those of that genus. Fig. Pachyornis clcphantopus.—Sternum. \. a, costal process ; b, lateral process. The sternum (fig. 64) is flat, and very broad and short, with no coracoidal facets, a very small xiphisternal notch, broad and short costal processes, broad and widely divergent lateral processes, and only two costal articulations. The pelvis is extremely low and wide, with the anterior wall of the acetabulum very deeply concave, the ventral surface of all the vertebrae behind the true sacrals narrow and convex, and from which the very broad sacral ribs ascend to join the ilium, of which the inferior postacetabular border is very sharp and descends far below the level of the ribs ; there is no pectineal process to the pubis. The tibio-tarsus (fig. 65, B) is very short, with the shaft curved outwards, the distal extremity markedly inflected, the fibular ridge much shorter than in the pre- ceding genera, and the fibular border below the smooth space at the distal extremity of the fibular ridge extremely rough ; the distal extensor tubercle is very prominent, and situated partly on the line of the upper half of the extensor groove, instead of being altogether external to the same. The tarso-metatarsus (fig. 66) is still shorter and wider than in Emeus, the width at the middle of the shaft being usually rather more than one third of the length ; the third 1 Ibis, ser. 3, vol. iv. p. 212 (1S74). - Haast assigned to his Pahtpteryx a broad-beaked skull, but the error is correcLed by Huttou, Traus. N. Zealand Inst. vol. ix, p. Please note that these images are extra
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