The distal extremity of the tibio-tarsus is not inflected. A hallux is present in some species. The tibio-tarsus and tarso-metatarsus are long and slender, the length of the latter equalling and more often exceeding the length of the femur, and also exceeding half the length of the tibio-tarsus. The femur is comparatively long and slender, with a short neck, the head rising but slightly and projecting only a small distance, the linear aspera in the form of a long irregular line, the outer side of the distal extremity moderately expanded, the popliteal depression small, deep, and sharply defined, the profile of the inner condyle semi-ovoid and narrow, and the interior trochlear surface nearly flat. The phalangeals of the pes are long and comparatively slender, the proximal surface of the terminal segments not being trefoil-shaped. In the vertebral column the middle cervicals are long and narrow, with the postzygapophyses directed much outwardly and separated by a very deep channel, and the posterior face of the centrum low and wide. The dorsals have short transverse processes and neural spine, the anterior and middle ones (those with a haemal spine or carina) having a large anterior pneumatic foramen between the nib-facet, the foramen being triangular in shape. All the species of this genus are of comparatively large size, and include the tallest members of the family. Type of the genus: _Dinornis novaezealandiae_ (Owen). Number of species: 7. {192} DINORNIS MAXIMUS OWEN. _Dinornis maximus_ Owen, Trans. Zool. Soc. VI. p. 497 (1868). _D. excelsus_ Hutton, Trans. N.Z. Inst. XXIV. p. 110 (1892). _D. giganteus_ Haast, Trans. N.Z. Inst. I p. 88, No. 20 part. This is the largest species of Moa, the tibio-tarsus being from 37.5 to 39.2 inches in length, while that of the largest _D. giganteus_ does not exceed 35 inches, but by far the largest number of the latter are considerably shorter. The type bones were obtained in Glenmark Swamp, Middle Island of New Zealand, and were sent to Professor Owen by Major J. Michael of the Madras Staff Corps. Casts of these bones are in the British Museum, No. A 161 in the Palaeontological Department. This bird was the tallest of all known birds, though it must have been considerably exceeded in bulk by _Aepyornis ingens_ and _Aepyornis titan_ of Madagascar. Locality: Glenmark Swamp, Middle Island, New Zealand. DINORNIS ALTUS OWEN. _Dinornis maximus_ Owen, Ext. Birds N.Z. p. 253 (Dr. Lillie's specimen) (1879). _D. altus_ Owen, Ext. Birds N.Z. (1879) p. 361. _D. giganteus var maximus_ Owen, Trans. Zool. Soc. VI p. 497 (1868).