popliteal area is very broad, as in Pachyornis elephantopus and E. ponderosa, but it differs from both in not having the rough line along the inner side of the popliteal area broken by a smooth groove; the head also does not rise so rapidly as in either of those species. The vertebræ show considerable differences from those of P. elephantopus, especially in the centra of the cervicals being more compressed. These differences may be, perhaps, of generic value; but, until the skull is known with certainty, it is better to keep it, as well as the next species, in Pachyornis. This species also occurred at Glenmark and at Hamilton's; but the typical form was not found at Enfield. There were, however, a few specimens of a larger bird which, for the present, I refer to this species, although it may probably be distinct. The metatarsus is 9.5in. and the tibia 20.5in. in length. The other dimensions will be found in the table at the end of the paper. Pachyornis valgus. This-species is founded on a pair of tibiæ from Enfield, so different from any others in the extraordinary internal expansion of the distal end that I feel compelled to distinguish them under a separate name. The dimensions are as follow: Length, 18.0in. (457mm.); Proximal width, 5.7in. (143mm.); width of shaft, 1.7in. (43mm.); distal width, 3.3in. (84mm.). This distal expansion of the tibia, nearly twice that of the shaft, is not really greater than in the smaller species of Dinornis, but it takes place so much more rapidly that it is much more conspicuous. The metatarsus which I associate with these tibiæ has a length of 8.5in. (216mm.); the proximal width is 3.5in. (89mm.); the width of the shaft, 1.9in. (48mm.); and the distal width is 4.2in. (107mm.). It closely resembles the same bone in E. crassus, and can only be distinguished from it by the greater proximal width, necessary to articulate with the expanded distal end of the tibia. A similar metatarsus is in the collection from Glenmark, and there were one or two in the Hamilton swamp, but I never before saw a tibia like the present one. I have also temporarily placed here a pair of femora from Enfield, very different from any others, and for which I can find no other place. The length is 11in. (279mm.); proximal width, 4.0in. (101mm.); width of shaft, 2in. (51mm.); distal width, 5.0in. (127mm.). They are specially remarkable for the short head combined with a very stout shaft.